37. To succeed in a difficult task,_____.

A. one needs to work hard B. to work hard is needed

C. you need be a hard working person D. to work hard is what one needs

36. You miss the lesson, though we have it on Thursday.

A. mustn't...needn't B. needn't....mustn't

C. mustn't...mustn't D. needn't...needn't

35. Must we come tomorrow?

A. No, you can't B. No, you needn't

C. No, you mustn't D. No, you may not

34. you be happy!

A. May B. Can C. Must D. Would

33. Since it is already midnight, we______.

A. had better leaving B. ought to have leave

C. should take our leave D. might as well leave

32. They have not finish the work up to now.

____Well, they ______

A. should have B. should C. ought to D. ought have

31. "When _____ he leave the hospital?" I asked the doctor.

A. will B. shall C. can D. may

30. The streets are all dry. It_____ during the night.

A. can't have rained B. must have rained

C. couldn't rain D. shouldn't have rained

29. As a soldier, you do as the head tells you.

A. will B. shall C. may D. ought

28. I give you an answer tomorrow. I promise!

A. must B. will C. may D. shall