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16. She ______ on her way to school, I just phoned her home and no one answered me.

A. should be

B. must have been

C. needn’t have been

D. had to be

17. Mr. Zhang isn’t here yet, I think he ______about the meeting.

A. should have forgotten

B. ought to forget

C. must have forgotten

D. may forget

18. I don’t know who is going to get the contract. We _______ get it but nothing is sure.

A. must

B. can’t

C. might

D. needn’t

19. -you realize that you were driving at 100 miles per hour ,don’t you?

-No, officer. I ______ have been, this car can’t do more than 70.

A. needn’t

B. shouldn’t

C. couldn’t

D. might not

20. “Do you have to leave?” “Sorry, but I really ______ .”

A. have

B. had to

C. do so

D. must

21. No one ______ that to his face.

A. dare to say

B. dares say

C. dares saying

D. dare say

22. I’ m sorry I ______ to tell you I was coming.

A. ought to phone

B. should phone

C. need to phone

D. ought to have phoned

23. It was so dark outside that he ______.

A. didn’t dare to go out to fetch water

B. dare not to go out to fetch water

C. doesn’t dare to go out to fetch water

D. not dare to go out to fetch water

24. May I hand in my exercise book tomorrow? No, you ______. Today is the deadline.

A. can’t

B. mustn’t

C. won’t

D. had better don’t

25. Will you stay for lunch? Sorry, ______. My brother is coming to see me.

A. I mustn’t

B. I can’t

C. I needn’t

D. I won’t