31. _______ the importance of wearing seat belts while driving.

A. Little they realize B. They little do realize

C. Little realize do they D. Little do they realize

32. They will go home for winter vacation as soon as they_______ their exams.

A. have finished B. finish

C. will finish D. will have finished

33. Without your help, we_______ so much.

A. didn't achieve B. would not have achieved

C. will not achieve D. don't achieve

34. They sent us their statement, _______ to get our support.

A. hoped B. to hope

C. hoping D. having hoped

35. The time will ***e _______ man can fly to outer space freely.

A. that B. when C. in that D. which

36. My wallet is nowhere to be found. I _______ when I was on the bus.

A. must have dropped it B. must drop it

C. should have dropped it D. ought to have dropped it

37. Arriving at the bus stop, _______ waiting there.

A. he found a lot of people B. a lot of people were

C. he found a lot of people's D. people were found

38. "She must be in the dormitory now." "No, she _______ be there. I saw her in the classroom a minute ago. "

A. mustn't B. couldn't C. can't have D. wouldn't

39. _______ you were busy, I wouldn't have bothered you with my questions.

A. If I realized B. Had I realized

C. Did I have realized that D. As I realized

40. Tom said that he wouldn't mind _______.

A. to wait for us B. waiting for us

C. wait for us D. for waiting us

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