中小学教育资源及组卷应用平台
Unit
4
Astronomy：the
science
of
the
Stars训练三
习题小练
一
二
三
四
单项语法填空
7选5
语法填空
改错
1.
单项语法填空（知识点复习）
1．The
earth
becam
(?http:?/??/?www.21cnjy.com?)e
so
（violence）
that
it
was
not
clear
whether
the
shape
would
last
or
not．21世纪教育网版权所有
2．After
that，
a
(?http:?/??/?www.21cnjy.com?)
began
to
form
and
combine
to
create
stars
and
other
bodies．
3．She
lost
heart
sin
(?http:?/??/?www.21cnjy.com?)ce
she
failed
in
the
exam．
She
was
puzzled
her
future．
She
had
no
idea
what
to
do
next．21教育网
4．He
told
us
happily
t
(?http:?/??/?www.21cnjy.com?)hat
his
wife
would
give
birth
a
baby
next
week
and
that
he
would
be
a
father．21cnjy.com
5．Reading
in
dim
light
is
harmful
your
eyes．
6．Not
until
he
(?http:?/??/?www.21cnjy.com?)
went
through
real
hardship
he
realize
the
love
we
have
for
our
families
is
important．21·cn·jy·com
7．That
guy
was
a
dangerous
person．
You
should
watch
for
him．
8．Only
when
he
apologizes
for
rudeness
I
speak
to
him
again．
9．The
heavy
smoke
fro
(?http:?/??/?www.21cnjy.com?)m
the
big
fire
is
rising
into
the
sky，
blocking
the
sunlight．www.21-cn-jy.com
10．After
the
(?http:?/??/?www.21cnjy.com?)second
competitor
went
off
the
stage，
my
son
went
onto
it
to
perform
his
turn．【来源：21·世纪·教育·网】
二．7选5
阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。
???
How
to
Avoid
an
Internet
Addiction
???
While
it
(?http:?/??/?www.21cnjy.com?)may
seem
like
everyone
surfs
the
web
these
days,
there
is
a
fine
line
between
casually
checking
your
social
media
pages
and
having
a
full?blown
Internet
addiction.
If
you
fear
that
you
may
lose
interest
in
other
aspects
of
your
life
because
you
prefer
to
be
on
the
Internet,
you
may
be
on
your
way
to
an
Internet
addiction.
________2·1·c·n·j·y
???
Admit
you
are
at
risk
of
an
addiction.
???
More
and
more
(?http:?/??/?www.21cnjy.com?)people
in
the
world
are
becoming
addicted
to
the
Internet.
You
are
not
the
only
one
with
this
problem,
and
it
is
becoming
more
and
more
common
and
more
and
more
well?known.
________21
cnjy
com
???
Set
aside
limited
time
for
computer
use.
???
Make
sur
(?http:?/??/?www.21cnjy.com?)e
not
to
turn
it
on
too
many
times
a
week.
If
you
have
a
laptop,
make
sure
to
put
it
somewhere
that
you
can
remember
but
not
somewhere
that
you
see
every
day.
Try
keeping
the
lid
closed
when
you
are
not
using
it.
________If
you
have
a
desktop
PC,
try
not
to
go
near
it
or
put
something
over
it
like
a
sheet.
【版权所有：21教育】
???
Call
people
instead
of
sending
instant
messages
or
texts.
21
cnjy
com
???
If
you
are
fre
(?http:?/??/?www.21cnjy.com?)e
on
weekends,
call
friends
and
ask
them
to
go
outside.
This
will
distract
you
from
the
computer.
________
???
Use
an
alarm
clock
or
timer.
???
Before
using
(?http:?/??/?www.21cnjy.com?)your
computer,
decide
on
a
time
limit
such
as
30
minutes.
Set
the
clock
or
timer
and
make
sure
that
you
get
off
the
computer
when
the
time
is
up.
Alternatively
create
a
shutdown
timer
on
your
desktop.
________
A.
Make
a
small
list
of
what
you
want
to
do
within
that
time.
www-2-1-cnjy-com
B.
When
the
compute
(?http:?/??/?www.21cnjy.com?)r
is
not
looking
at
you,
you
are
less
likely
to
use
it.
C.
This
can
be
pr
(?http:?/??/?www.21cnjy.com?)ogrammed
to
shut
down
your
computer
after
the
set
time.
D.
Luckily,
there
(?http:?/??/?www.21cnjy.com?)
are
ways
to
avoid
living
your
life
in
front
of
the
computer.
E.
This
will
stop
(?http:?/??/?www.21cnjy.com?)
you
from
using
the
Internet
so
often
or
going
on
to
another
page.
F.
If
you
have
a
(?http:?/??/?www.21cnjy.com?)
problem
on
weekdays,
phone
your
friends
or
ask
for
help
in
person.
G.
Do
not
be
embarrass
(?http:?/??/?www.21cnjy.com?)ed;
find
others
with
the
same
problem
and
help
each
other
beat
it.
2-1-c-n-j-y
【答案】
D；G；B；F；C
3．语法填空
阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
The
Roar(咆哮)
of
Lava
???
A
strange
sound
(?http:?/??/?www.21cnjy.com?)
ripped
my
father
out
of
his
sleep.
What
he
didn't
know
at
that
moment
was
that
the
volcano
Mauna
Loa
had
begun
to
erupt,
and
the________(disturb)
sound
he
heard
was
the
roar
of
lava.
Soon,
people
in
my
father's
village
figured
out
what
was
happening,
and
all
the________(family)
fled
the
village
for
safer
areas.
It
was
scary,
but
people
stayed
calm.
________(lucky),
no
one
was
hurt,
but
as
the
lava
made
its
way
to
the
ocean,
it
________(destroy)
homes
and
parts
of
the
highway.
【出处：21教育名师】
???
Every
time
(?http:?/??/?www.21cnjy.com?)
I
heard
my
father
tell
this
dramatic
tale,
I
watched
his
eyes
light
________I
could
tell
that,
even
many
years
later,
my
father
was
both
scared
and
amazed
at
the
grand
volcano.
So,
it
was
in
high
school
________?I
decided
to
make
a
career
out
of
studying
Mauna
Loa.
21教育名师原创作品
???
Now,
I
work
with
o
(?http:?/??/?www.21cnjy.com?)ther
scientists
studying
Mauna
Loa,
one
of
Earth's
largest
active
Volcanoes.
Of
course,
we
can't
control
the
eruptions,
but
we
can
use
the
data
we
collect________(predict)
where
the
lava
might
flow
next.
We
study
geographical
maps
and
examine
where
lava
flowed
during
past
eruptions.
I
even
collect
gas
and
lava
samples
that
come
directly
from
the
volcano.
We
can
use
the?
________(inform)
to
help
keep
people
safe.
???
I
feel
l
(?http:?/??/?www.21cnjy.com?)ucky
to
spend
my
days
so
close
to
an
active
volcano,
________I
think
is
one
of
Earth's
greatest
wonders.
Like
my
father,
I
am
both
frightened
and
in
awe(敬畏)of
________(it)power.【来源：21cnj
y.co
m】
四．改错
假定英语课上老师要求同桌之
(?http:?/??/?www.21cnjy.com?)间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(?)，并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线，并在该词下面写出修改后的词。
注意:
⒈每处错误及其修改均仅限一词；
⒉只允许修改10处，多者(从第11处起)不计分。
???
Today
I
(?http:?/??/?www.21cnjy.com?)visited
the
West
Lake,
Hangzhou,
where
is
extremely
beautiful
on
spring.
I
saw
many
young
people
rode
shared
bikes
as
they
offered
so
much
convenient.
With
so
many
bikes
offered
by
different
company,
you
can
find
a
bike
almost
everywhere.
Also,
you
can
drop
them
anywhere
you
want
and
they
are
cheap
to
use
them.
This
new
service
is
much
good
than
public
bikes.
When
someone
wants
to
use
a
public
bike,
he
has
lo
find
a
bike
station.
He
also
needed
a
station
to
return
it.
As
result,
he
has
to
walk
any
distance
to
fetch
or
return
it.21·世纪
教育网
21世纪教育网
www.21cnjy.com
精品试卷·第
2
页
（共
2
页）
HYPERLINK
"http://21世纪教育网(www.21cnjy.com)
"
21世纪教育网(www.21cnjy.com)中小学教育资源及组卷应用平台
Unit
4
Astronomy：the
science
of
the
Stars训练三
习题小练
一
二
三
四
单项语法填空
7选5
语法填空
改错
1.
单项语法填空（知识点复习）
1．The
earth
became
(?http:?/??/?www.21cnjy.com?)so
（violence）
that
it
was
not
clear
whether
the
shape
would
last
or
not．2·1·c·n·j·y
2．After
that，
a
(?http:?/??/?www.21cnjy.com?)
began
to
form
and
combine
to
create
stars
and
other
bodies．
3．She
lost
h
(?http:?/??/?www.21cnjy.com?)eart
since
she
failed
in
the
exam．
She
was
puzzled
her
future．
She
had
no
idea
what
to
do
next．【来源：21·世纪·教育·网】
4．He
told
us
happily
t
(?http:?/??/?www.21cnjy.com?)hat
his
wife
would
give
birth
a
baby
next
week
and
that
he
would
be
a
father．21·世纪
教育网
5．Reading
in
dim
light
is
harmful
your
eyes．
6．Not
until
he
(?http:?/??/?www.21cnjy.com?)went
through
real
hardship
he
realize
the
love
we
have
for
our
families
is
important．www-2-1-cnjy-com
7．That
guy
was
a
dangerous
person．
You
should
watch
for
him．
8．Only
when
he
apologizes
for
rudeness
I
speak
to
him
again．
9．The
heavy
smoke
f
(?http:?/??/?www.21cnjy.com?)rom
the
big
fire
is
rising
into
the
sky，
blocking
the
sunlight．2-1-c-n-j-y
10．After
the
second
c
(?http:?/??/?www.21cnjy.com?)ompetitor
went
off
the
stage，
my
son
went
onto
it
to
perform
his
turn．【版权所有：21教育】
1．【句意】地球变得如此剧烈，以至于不清楚这个形状是否会持续下去．
答案：violent，考查单词，作表语，表示"狂暴的"，所以用形容词violent作表语．
2．【句意】在那之后，原子开始形成并结合形成恒星和其他天体．
答案．atoms．考查单词拼写．根据句意和首字母提示可知这里使用这句话使用名词atom，意为"原子"，这里是复数概念．21教育名师原创作品
3．【句意】她考试不及格后就失去了信心．她对自己的未来感到困惑．她不知道下一步该做什么．
答案：about，考查固定搭配，
(?http:?/??/?www.21cnjy.com?)根据句意"她考试不及格后就失去了信心．她对自己的未来感到困惑．她不知道下一步该做什么．"，可知要填的词为"about"，构成固定搭配be
puzzled
about对…困惑．21世纪教育网版权所有
4．【句意】他高兴地告诉我们，他妻子下周要生一个孩子，他要当爸爸．
答案：
to
，考查固定搭配，根据句意"他高
(?http:?/??/?www.21cnjy.com?)兴地告诉我们，他妻子下周要生一个孩子，他要当爸爸．"，可知要填的词为"
to
"，构成固定搭配give
birth
to生育．21
cnjy
com
5．【句意】在昏暗的光线下看书对眼睛有害．
答案：to，考查固定搭配
(?http:?/??/?www.21cnjy.com?)，根据句意"在昏暗的光线下看书对眼睛有害．"，可知要填的词为"to"，构成固定搭配be
harmful
to对…有害．
6．【句意】直到他经历了真正的困难，他才意识到我们对家庭的爱是重要的．
答案：did，考查倒装句，
(?http:?/??/?www.21cnjy.com?)not
until放在句首，构成句子的部分倒装，描述过去的事情，所以用一般过去时态，所以把助动词did拿到主语前面．
7．【句意】那家伙是个危险人物．你应该小心他．
答案：out
，考查固定搭
(?http:?/??/?www.21cnjy.com?)配，根据句意"那家伙是个危险人物．你应该小心他．"，可知要填的词为"out
"，构成固定搭配watch
out
for当心．
8．【句意】只有当他为无礼道歉时，我才会再和他说话．
答案：do，考查倒装句，only+状语放在句首构成句子的部分倒装，本句为一般现在时态，所以把助动词do放在主语前面．
9．【句意】大火冒出的浓烟升上天空，挡住了阳光．
答案：
off
，考查固定搭配，根据句意"大
(?http:?/??/?www.21cnjy.com?)火冒出的浓烟升上天空，挡住了阳光．"，可知要填的词为"
off
"，构成固定搭配
block
off
阻挡．
10．【句意】第二名选手下台后，我儿子依次上台表演．
答案：in，考查固定搭配，根据句意"
(?http:?/??/?www.21cnjy.com?)第二名选手下台后，我儿子依次上台表演．"，可知要填的词为"in"，构成固定搭配in
one's
turn轮到某人．
二．7选5
阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。
???
How
to
Avoid
an
Internet
Addiction
???
While
it
may
see
(?http:?/??/?www.21cnjy.com?)m
like
everyone
surfs
the
web
these
days,
there
is
a
fine
line
between
casually
checking
your
social
media
pages
and
having
a
full?blown
Internet
addiction.
If
you
fear
that
you
may
lose
interest
in
other
aspects
of
your
life
because
you
prefer
to
be
on
the
Internet,
you
may
be
on
your
way
to
an
Internet
addiction.
________【来源：21cnj
y.co
m】
???
Admit
you
are
at
risk
of
an
addiction.
???
More
and
more
(?http:?/??/?www.21cnjy.com?)people
in
the
world
are
becoming
addicted
to
the
Internet.
You
are
not
the
only
one
with
this
problem,
and
it
is
becoming
more
and
more
common
and
more
and
more
well?known.
________
???
Set
aside
limited
time
for
computer
use.
???
Make
sure
not
(?http:?/??/?www.21cnjy.com?)
to
turn
it
on
too
many
times
a
week.
If
you
have
a
laptop,
make
sure
to
put
it
somewhere
that
you
can
remember
but
not
somewhere
that
you
see
every
day.
Try
keeping
the
lid
closed
when
you
are
not
using
it.
________If
you
have
a
desktop
PC,
try
not
to
go
near
it
or
put
something
over
it
like
a
sheet.
???
Call
people
instead
of
sending
instant
messages
or
texts.
???
If
you
are
(?http:?/??/?www.21cnjy.com?)
free
on
weekends,
call
friends
and
ask
them
to
go
outside.
This
will
distract
you
from
the
computer.
________
???
Use
an
alarm
clock
or
timer.
???
Before
using
your
(?http:?/??/?www.21cnjy.com?)
computer,
decide
on
a
time
limit
such
as
30
minutes.
Set
the
clock
or
timer
and
make
sure
that
you
get
off
the
computer
when
the
time
is
up.
Alternatively
create
a
shutdown
timer
on
your
desktop.
________
A.
Make
a
small
list
of
what
you
want
to
do
within
that
time.
B.
When
the
(?http:?/??/?www.21cnjy.com?)computer
is
not
looking
at
you,
you
are
less
likely
to
use
it.
C.
This
can
be
(?http:?/??/?www.21cnjy.com?)
programmed
to
shut
down
your
computer
after
the
set
time.
D.
Luckily,
there
are
(?http:?/??/?www.21cnjy.com?)
ways
to
avoid
living
your
life
in
front
of
the
computer.
E.
This
will
stop
yo
(?http:?/??/?www.21cnjy.com?)u
from
using
the
Internet
so
often
or
going
on
to
another
page.
F.
If
you
have
a
(?http:?/??/?www.21cnjy.com?)problem
on
weekdays,
phone
your
friends
or
ask
for
help
in
person.
G.
Do
not
be
embarr
(?http:?/??/?www.21cnjy.com?)assed;
find
others
with
the
same
problem
and
help
each
other
beat
it.
21cnjy.com
【答案】
D；G；B；F；C
【解析】本文是一篇说明文，就如何避免网瘾提
(?http:?/??/?www.21cnjy.com?)出了建议。
（1）考查对上下文的理解和推理判断能力。根据空前谈到网瘾会导致你对生活的其他方面失去兴趣；以及空后的几条建议则是有关如何避免网瘾的,
D项对全文起着承上启下的作用。故选D。
（2）考查对上下文的理解和推理判断能力。根据本段的标题“Admit
you
are
at
risk
of
an
addiction.
”,
再根据空前“More
and
more
people
in
the
world
are
becoming
addicted
to
the
Internet.
You
are
not
the
only
one
with
this
problem,
and
it
is
becoming
more
and
more
common
and
more
and
more
well?known.”越来越多的人有网瘾,
这是一个普遍现象，可知,
?G.
Do
not
be
embarrassed;
find
others
with
the
same
problem
and
help
each
other
beat
it.“不要觉得不好意思,
找到和你一样有网瘾的人,
互相帮助去战胜网瘾”符合语境，故选G。
（3）考查对上下文的理解和推理判断能力。根据空前的“Try
keeping
the
lid
closed
when
you
are
not
using
it.
”可知,
作者建议你不用电脑时,
把它合上,
B.
When
the
computer
is
not
looking
at
you,
you
are
less
likely
to
use
it.“看不到电脑时,
你用它的可能性就小。”符合语境，故选B。
（4）考查对上下文的理解和推理判断能力。根据本段的标题“Call
people
instead
of
sending
instant
messages
or
texts.”给朋友打电话而不是在网上发信息；以及空前“call
friends
and
ask
them
to
go
outside”与F项中的“phone
your
friends
or
ask
for
help
in
person”,
还有上文的“on
weekends”与F项中的“on
weekdays”前后呼应。故选F。
（5）考查对上下文的理解和推理判断能力。本段的主题是“Use
an
alarm
clock
or
timer.
”,
作者建议使用闹钟或定时器来限制上网的时间,
空前的“shutdown
timer”与C项中的“shut
down
your
computer
after
the
set
time”相对应。故选C。
3．语法填空
阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
The
Roar(咆哮)
of
Lava
???
A
strange
sound
r
(?http:?/??/?www.21cnjy.com?)ipped
my
father
out
of
his
sleep.
What
he
didn't
know
at
that
moment
was
that
the
volcano
Mauna
Loa
had
begun
to
erupt,
and
the________(disturb)
sound
he
heard
was
the
roar
of
lava.
Soon,
people
in
my
father's
village
figured
out
what
was
happening,
and
all
the________(family)
fled
the
village
for
safer
areas.
It
was
scary,
but
people
stayed
calm.
________(lucky),
no
one
was
hurt,
but
as
the
lava
made
its
way
to
the
ocean,
it
________(destroy)
homes
and
parts
of
the
highway.
21教育网
???
Every
tim
(?http:?/??/?www.21cnjy.com?)e
I
heard
my
father
tell
this
dramatic
tale,
I
watched
his
eyes
light
________I
could
tell
that,
even
many
years
later,
my
father
was
both
scared
and
amazed
at
the
grand
volcano.
So,
it
was
in
high
school
________?I
decided
to
make
a
career
out
of
studying
Mauna
Loa.
???
Now,
I
work
wi
(?http:?/??/?www.21cnjy.com?)th
other
scientists
studying
Mauna
Loa,
one
of
Earth's
largest
active
Volcanoes.
Of
course,
we
can't
control
the
eruptions,
but
we
can
use
the
data
we
collect________(predict)
where
the
lava
might
flow
next.
We
study
geographical
maps
and
examine
where
lava
flowed
during
past
eruptions.
I
even
collect
gas
and
lava
samples
that
come
directly
from
the
volcano.
We
can
use
the?
________(inform)
to
help
keep
people
safe.
【出处：21教育名师】
???
I
feel
luck
(?http:?/??/?www.21cnjy.com?)y
to
spend
my
days
so
close
to
an
active
volcano,
________I
think
is
one
of
Earth's
greatest
wonders.
Like
my
father,
I
am
both
frightened
and
in
awe(敬畏)of
________(it)power.
【答案】
disturb
(?http:?/??/?www.21cnjy.com?)ing；families；Luckily；destroyed；up；that；to
predict；information；which；its
【解析】本文是一篇记叙文，讲述了作
(?http:?/??/?www.21cnjy.com?)者听父亲讲述Mauna
Loa火山爆发时
的?事情，父亲每次讲这个戏剧性的故事时眼睛都会发亮，作者在高中时决定以研究Mauna
Loa火山为职业，介绍了作者和其他科学家研究Mauna
Loa火山的情况。
（1）考查形容词。修饰后文名词sound应用形容词disturbing作定语，表示“令人不安的”。故填disturbing。
（2）考查名词。句意：很快，我父亲所在的村子里的人知道了发生了什么，所有的家庭都逃离了村子，逃往更安全的地方。family为可数名词，由all修饰应用复数形式。故填families。
（3）考查副词。修饰下文整个句子应用副词luckily，表示“幸运地”。句首单词首字母要大写。故填Luckily。
（4）考查时态。根据上文“no
one
was
hurt,
but
as
the
lava
made
its
way
to
the
ocean”可知此处应用一般过去时。故填destroyed。
（5）考查介词。句意：每次我听父亲讲这个戏剧性的故事，我都看到他的眼睛发亮。我能说，即使多年以后，父亲对这座大火山还是既害怕又惊讶。light
up固定短语，“发亮”，故填up。
（6）考查强调句。本句中去掉it
was和连接词部分，剩下的部分可以构成完整的句子，可知本句为强调句结构“it
is/was+被强调部分+that+其他”，被强调部分为人时，that可以用who替换。本句中被强调部分为“in
high
school”应用that。故填that。
（7）考查非谓语动词。句意：当然，我们无法控制火山喷发，但我们可以利用收集到的数据来预测下一次岩浆可能流向何方。use
sth.
to
do
sth.固定短语，“用某物做某事”，故填to
predict。
（8）考查名词。此处作use的宾语，表示“信息”应用名词information。故填information。
（9）考查定语从句。句意：我觉得很幸运，每天都在离活火山这么近的地方度过，我认为活火山是地球上最伟大的奇观之一。此处为非限制性定语从句修饰先行词volcano，且先行词在从句中作主语，指物应用关系代词which，that不能引导非限制性定语从句。故填which。
（10）考查代词。句意：像我父亲一样，我对它的力量既害怕又敬畏。修饰下文名词power应用形容词性物主代词its。故填its。
四．改错
假定英语课上老师要求同桌之间交换修
(?http:?/??/?www.21cnjy.com?)改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
21·cn·jy·com
增加:在缺词处加一个漏字符号(?)，并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线，并在该词下面写出修改后的词。
注意:
⒈每处错误及其修改均仅限一词；
⒉只允许修改10处，多者(从第11处起)不计分。
???
Today
I
visite
(?http:?/??/?www.21cnjy.com?)d
the
West
Lake,
Hangzhou,
where
is
extremely
beautiful
on
spring.
I
saw
many
young
people
rode
shared
bikes
as
they
offered
so
much
convenient.
With
so
many
bikes
offered
by
different
company,
you
can
find
a
bike
almost
everywhere.
Also,
you
can
drop
them
anywhere
you
want
and
they
are
cheap
to
use
them.
This
new
service
is
much
good
than
public
bikes.
When
someone
wants
to
use
a
public
bike,
he
has
lo
find
a
bike
station.
He
also
needed
a
station
to
return
it.
As
result,
he
has
to
walk
any
distance
to
fetch
or
return
it.www.21-cn-jy.com
【答案】
①where→
(?http:?/??/?www.21cnjy.com?)which
②on→in
③rode→riding
④convenient→convenience
⑤company→companies
⑥去掉them
⑦good→better
⑧needed→needs
⑨As后面加上a
⑩any→some
21
cnjy
com
【解析】本文是一篇说明文，介绍了共享单车给
(?http:?/??/?www.21cnjy.com?)人们带来的便利和好处。
（1）考查定语从句。此处先行词是the
West
Lake
，关系词在从句中做主语，应使用关系代词。故where改为which。
（2）考查介词。"在春天"，应使用介词in。故on改为in。
（3）考查非谓语动词。句意：我看到许多年轻人正在骑共享单车。see
sb.
doing
sth.固定短语，"看见某人正在做某事"。故rode改为riding。
（4）考查名词。此处做offer的宾语，应使用名词。故convenient改为convenience。
（5）考查名词。根据different
可知，此处应使名词复数，意为"不同的公司"。故company
改为companies。
（6）考查代词。句意：它们使用起来很便宜。此处to
use的逻辑宾语是主语they，不需要再加宾语，因此them多条。故去掉them。
（7）考查形容词。much修饰比较级，且其后有介词than，因此应使用比较级。故good改为better。
（8）考查时态。根据语境可知，此处描述的目前的情况，应使用一般现在时。故needed改为needs。
（9）考查冠词。as
a
result固定短语，"结果"。故As后面加上a。
（10）考查代词。句意：他必须走一段路去取或归还它。any"任何"，some"一些"。故any改为some。
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