D. will; knew

　　--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

　　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

　　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

　　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

　　My aunt _____ here by now, for she took the early bus.

　　A. must arrive

　　B. can arrive

　　C. may arrive

　　D. ought to have arrived

　　You _____ phone him if you want to, but you _____! He will surely phone you.

　　A. may; mustn’t

　　B. have to; needn’t

　　C. can; needn’t

　　D. can; doesn’t need

　　— Is John coming by train?

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