16、Tan：“Father, may I go out and play football?”

Father：“　　　　 　you　　　　 (do) your homework?”

15、Li Ming often　　　　 (listen) to the radio in the morning.

14、They will have a trip (旅行) to the Great Wall if it　　　　 (not rain) tomorrow.

13、Mr. Yu　　　　 (teach) 　us math since 1982.

12、　　　　 　(be) your parents in Shanghai last year?

11、Listen! Who　　　　 (sing) in the next room now?

10、They usually　　　　 (do) their homework after supper.

9、If it　　　　 an interesting film, we’ll see it tomorrow. (be)

8、It　 　(take) him half an hour　 　　(finish) his homework yesterday.

7、I’m sorry to keep you　　　　 for a long time. (wait)