51. Under no circumstances _____ be left alone at home.

　　A、a three-year-old child should

　　B、should a three-year-old child

　　C、a three-year-old child should not

　　D、should a three-year-old child not

　　52. It was _____ the civil war came to an end.

　　A、in 1949 when

　　B、not until 1949 when

　　C、until 1949 that

　　D、not until 1949 that

　　53. _____go straight on to university why not get some work experience first?

　　A、More than

　　B、Rather than

　　C、Other than

　　D、Better than

　　54. Mr. Brown wished he _____ longer this morning, but he had to get up early to attend a meeting.

　　A、could have slept

　　B、should sleep

　　C、might have slept

　　D、would sleep

　　55. The shy girl has won the gold medal in the speaking contest, _____ I find hard to believe.

　　A、that

　　B、which

　　C、who

　　D、whom

　　56. More than three nature reserves have been established in this area _____ hunting is forbidden.

　　A、that

　　B、since

　　C、where

　　D、if

　　57. Schools in the north tend to be better equipped, _____ those in the south are relatively poor.

　　A、and

　　B、while

　　C、but

　　D、however

　　58. _____ by the armed police, the bank robbers had no choice but to surrender.

　　A、To be surrounded

　　B、Surrounding

　　C、Having surrounded

　　D、Surrounded

　　59. Many things – going abroad, owning a car, _____ impossible in the past are now very common.

　　A、being considered

　　B、to be considered

　　C、were considered

　　D、considered

　　60. By the end of this month we _____ ten lessons.

　　A、will cover

　　B、covered

　　C、will have covered

　　D、have covered

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