39.Had electronic computers not been invented, many problems of space flight ______.

a.could be not solved b. could not be solved

b.could not have been solved d. could not have solved

40.He is a poorly learnt man. But he acts as though he ______.

a. is b. were c. should be d. seems like

41.The driver looked over the engine carefully lest it ______ on the way.

a. goes wrong b. go wrong c. went wrong d. would go wrong

42.______ the fog, we should have reached our destination.

a. Because of b. In spite of c. In case of d. But for

43.The old man went to office on foot, but he ______ by bus.

a. might have gone b. ought have gone c. could have gone d. should be gone

44.He is working hard for fear that he ______ to pass the exam.

a. fails b. may fail c. should fail d. would fail

45.She put on her glasses in order that she _____.

a. can see b. saw c. had seen d. might see

46.Whatever ______ we’ll go ahead.

a. had happened b. will happen c. might happen d. may be happened

47.If I ______ out of ink, I might have finished writing the paper.

a. hadn’t run b. shouldn’t run c. didn’t run d. haven’t run

48.But for your advice, I ______ into trouble.

a. would get b. got c. might have got d. should get

49.______ for the traffic jam, I should have covered fifty miles.

a. Had it been b. Had it not been c. It had not been d. It not had been

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