30.　　 The pilot kept calm in the terrible storm, otherwise the accident ______.

A. couldn’t be prevented

B. mustn’t have prevented

C. wouldn’t have been prevented

D. shouldn’t prevent

29.　　 You _____ pay your library fines. If not, you _____ not be allowed to graduate.

A. may; should　　　 B. should; need　　　 C. must; will　　　　 D. will; can

28.　　 Mr. Bush is on time for everything. How _____ it be that he was late for the opening ceremony?

A. can　 B. should　　　 C. may　 D. must

27.　　 --What do you think of it?

--I think it is a thing of importance that it ____ done soon.

A. is 　　　B. is to be 　　　C. be 　　　D. to be

26.　　 She is too slow. She ________ pass the test, but she __________ too little.

A. would; knew 　　　B. will; knows 　　　C. would; knows 　　　D. will; knew

25.　　 He _______ Shanghai, for I saw him talking with the headmaster a moment ago.

A. must have gone to　　　　　　　　　　　　　 B. can’t have gone to

C. mustn’t have been to　　　　　　　　　　　 D. can’t have been to

24.　　 　-Why didn’t you attend the lecture yesterday?

-I didn’t think that we _______ on Sundays.

A. should 　　　B. ought to have 　　　C. shouldn’t have 　　　D. will have to

23.　　 -I hear you have written a novel.

-Yes, the book ________ be out in a month or so.

A. can 　　　B. dare 　　　C. should 　　　D. need

22.　　 -Is there a fog in the evening?

-There _______ be. I’ll make a phone call to find it out.

A. must 　　　B. would 　　　C. will 　　　D. might

21.　　 -Is there any flight to Tokyo today?

- I think there _____, for the weather is too bad.

A. mustn’t be 　　　B. mightn’t be 　　　C. needn’t be 　　　D. can’t be