57.　 ______ you’ve got a chance, you might as well made full use of it.

A. Now that　　　 B. After　　　 C. Although　　　 D. As soon as

56.　 I tried to ______ him ______ driving the car too fast, but he refused.

A. prevent; from　　 B. protect; form　　 C. help; with　　 D. connect; to

55.　 We must ______ pollution ______ happily.

A. prevent; to live　 B. prevent; from living　 C. keep; doing　 D. keep; to live

54.　 Don’t worry. I’m sure you’ll succeed ______ if you work hard.

A. on time　　 B. in time　　 C. at times　　 D. ahead of time

53.　 Every possible means ______ to prevent their pollution, but the sky is still not clear.

A. is used　　 B. are used　　 C. has been used　　 D. have been used

52.　 I ______ him to come here early, but he was late for two hours.

A. had hoped　　 B. meant　　 C. had meant　　 D. hoped

51.　 In some parts of London, missing a bus means ______ for another hour.

A. waiting　　　 B. to wait　　　 C. wait　　　 D. to be waiting

50.　 The meeting was concerned ______ reforms and everyone present was concerned ______ their own interests.

A. with; for　　　 B. with; with　　　 C. for; about　　　 D. about; with

49.　 ______ English is concerned, he is first in our class.

A. As　　　 B. As soon as　　 C. As far as　　 D. Now that

48.　 While I agreed with what he said, my mother ______it. Which of the following is wrong?

A. was against　　 B. objected　　 C. was opposed to　　 D. opposed