16. They must have fulfilled their task yesterday, ____?

　　　 A. haven’t they　　　　　　 B. mustn’t they　　　 C. hadn’t they　　　　 D. didn’t they

15. He must have been there before, ____?A. hasn’t he　 B. haven’t he C. doesn’t he　　　 D. isn’t he

14. Chinese must have the largest number of speakers, ____? 　

　　　 A. mustn’t they　　　　　　 B. haven’t they　　　 C. don’t they　　　　 D. doesn’t it

13. They must be waiting for us with anxiety, ___ ?

　　　 A. mustn’t they　　　 B. don’t they　　　　 C. must they　　　　　 D. aren’t they

12. He must be a student, ____? A. mustn’t he　 B. needn’t he　 C. isn’t he 　　 D. doesn’t he　

11. He ____ Shanghai, for I saw him a short time ago.

　　　 A. must have gone to B. can’t have been to C. mustn’t have been to 　　　 D. can’t have gone to

10. He is writing with a pencil. He ___ have lost his pen.　 A. must B. can’t 　 C. might　 D. can

9. The ground is wet. It ___ have rained last night. A. can　 B. can’t C. must　 D. may

8. I must go home now,____?　　　 A. mustn’t I 　 B. needn’t I　　 C. mustn’t you　　　　　　　 D. both A and B

7. He had to stand and ____ the match. A. watching 　 B. to watch　　 C. watched　　 D. watch