Exercise
Ⅰ. 用if 或unless填空。
1. We won’t go to his party __________ he invites us.21·cn·jy·com
2. __________ I’m tired, I’ll have a rest.
3. I will lend you the money __________ you pay back on time.www-2-1-cnjy-com
4. __________ it snows tomorrow, we’ll have a day or two off.21cnjy.com
5. I won’t buy that wallet __________ it costs less than 100 yuan.2-1-c-n-j-y
Ⅱ. 使用括号中词语的正确形式填空。
1. If you put paper into ?re, it __________ (burn).【来源：21cnj*y.co*m】
2. If John __________ (go) to the supermarket at 7 p.m., he can buy a lot of cheap food.
3. —Shall we go on a picnic this weekend?
—Good idea! Unless it __________ (rain).
4. If I got good grades in junior high school, my parents__________ (take) me to travel.
5. We __________ (must) cross the road unless the light turns green.21世纪教育网版权所有
Ⅲ. 单项选择。
( ) 1. The meeting didn't start __________ everyone was there.21教育网
A. because B. until C. why D. if
( ) 2. I won’t believe you __________ I have seen it with my own eyes.【来源：21·世纪·教育·网】
A. before B. unless C. after D. when
( ) 3. Tom will call me if he __________ Shanghai.【出处：21教育名师】
A. arrives B. will reach C. arrives in D. get to
( ) 4. I’m sure he’ll come to see me before he __________ Beijing.【版权所有：21教育】
A. will leave B. is leaving C. leave D. leaves
( ) 5. Betty didn’t go to see the ?lm yesterday __________ she was ill.21教育名师原创作品
A. because B. but C. until D. if
( ) 6. __________ something dramatic happens, we usually remember it well.2·1·c·n·j·y
A. Though B. If C. Because D. Unless
( ) 7. I’d like to go swimming __________ the water is not too cold.21*cnjy*com
A. for B. unless C. if D. whether
( ) 8. I want to know __________ she is going to see a ?lm.www.21-cn-jy.com
A. if B. that C. what D. which
( ) 9. I’ll go to see the ?lm with you __________ I have time this evening.21*cnjy*com
A. whether B. so C. if D. when
( ) 10. __________ you study harder, you'll never pass the ?nal exam.
A. If B. Until C. Unless D. Except
Keys
Ⅰ.
1. unless 2. If 3. if 4. If 5. unless
Ⅱ.
1. will burn 2. goes 3. rains 4. will take 5. mustn’t21·世纪*教育网
Ⅲ.
1-5 ABCDA 6-10 ACACC
