31. ①The workers a new hospital since the end of last year.

②The workers a new hospital by the end of last year.

A. have built B. have been building

C. had built D. were building

32. ①It is 3 years his brother joined the army.

②It is 3 years ago his brother joined the army.

A. since B. that C. after D. before

33. ①They don’t know he will come unless told.

②They don’t know he will come until told.

A. that B. whether

C. how long D. if or not

34. ①I 10 dollars on the dictionary.

②I 10 dollars for the dictionary.

A. took B. cost

C. paid D. spent

35.　①He has two watches, but of them works well.

② He has two watches, and of them work well.

A. both B. none

C. neither D. either

36. ①—— Who did you see in the room?

—— .

②——How many people did you see in the room?

—— .

A. No one B. None

C. Anyone D. Any one

37.①“You be a bit tired.Why not stop to rest? ”

② “You be so tired that you had to stop to rest.”

A. should B. can’t

C. must D. mustn’t

38. ①Jenny have kept her word. I wonder why she changed her mind.

②Jenny have kept her word, I wonder why she didn’t change her mind.

A. must B. should

C. need D. would

39. ①This is the reason you all know.

②I really don’t know the reason Professor Li didn’t attend the meeting.

A. why B. which C. because D. that

40. ①He asked us the question the film was worth seeing.

②He made the suggestion the meeting should be put off.

A. when B. where C. that D. whether

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