I'm very busy () for the exam now. Will you come again at some other time.
A. to prepare
B. prepared
C. to be preparing
D. preparing
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Jack cannot swim. You （）save him right now!
A. may
B. can
C. must
D. will
I feel I must qualify my earlier remarks in case they have been misunderstood.
A. 我觉得我得把话说得具体些，以免他们不理解。
B. 我感到我必须言行一致，以免他们产生误解。
C. 我感到我必须符合我原先的讲话内容，以免他们理解错了。
D. 我觉得我得把我说过的话改得具体些，以免产生误解。
Mr. Lewis （）next month
A. returned
B. was returning
C. is returning
D. had been returning
It's been six months. You （）your research paper by now
A. have to finish
B. must finish
C. can finish
D. ought to finish
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