1. Don’t come into the lab ________ you are asked to.

　　A. unless B. until C. because D. since

　　2. People who eat breakfast are always in ________ spirits than those who don’t.[来源:学科网ZXXK]

　　A. good B. nice C. better D. best

　　3. Teenagers with working experiences know more clearly ________ they will be in the future.

　　A. who B. why C. where D. what

　　4. —The paper says Iron Man 3 is on this evening. Let’s go and see it. —But I _____it.

　　A. see B. saw C. have seen D. will see

　　5. —Someone is knocking at the door, dad! —Go and see _____.

　　A. who is it B. who it is C. who was it D. who it was

　　6.—Linda, I called you this morning, but nobody answered the phone.

　　—I'm sorry. I football with my friends then.

　　A. play B. played C. am playing D. was playing

　　7. The World Health Organization has given some advice on to protect us from being infected(感染)with H7N9. A. how B. what C. where D. when

　　8. the children have fun, parents can take dance lessons on the beach.

　　A. When B. If C. While D. Once

　　9.—How often do you chat with your friends online? — . I'm busy with my study.

　　A. Only one month. B. About twice a month. C. Almost every day. D. Maybe in two weeks.

　　10. —Sir, could you please put out your cigarette? This is a smoke-free (无烟的) school.

　　A. I'm sorry about this. B. No problem. C. Sure, I'd love to. D. Never mind.

　　参考答案：1-5ACDCB 6-10 DACBA