Unit 5 Buying and Selling Lesson 26 Cookies, Please！ 课时练习（含解析）

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Unit 5 Buying and Selling Lesson 26 Cookies, Please！
一、单选题
1．It’s very dangerous for us to play phones ________ we are walking on the street.
A．so B．while C．until D．unless
2．Cathy was singing in the room ________ his parents came in.
A．when B．while C．after D．since
3．—The little mouse in a red hat is...