50. The continuous rain _____ the harvesting of the wheat crop by two weeks.

　　A. set back B. set off C. set out D. set aside

　　51. Not having a good command of English can be a serious _____ preventing you from achieving your goals.

　　A. obstacle B. fault C. offense D. distress

　　52. It's very _____ of you not to talk aloud while the baby is asleep.

　　A. concerned B. careful C. considerable D. considerate

　　53. Many a player who had been highly thought of has _____ from the tennis scene.

　　A. disposed B. disappeared C. discouraged D. discarded

　　54. She's fainted. Throw some water on her face and she'll _____.

　　A. come round B. come along C. come on D. come out

　　55. All their attempts to _____ the child from the burning building were in vain.

　　A. regain B. recover C. rescue D. reserve

　　56. Computer technology will _____ a revolution in business administration.

　　A. bring around B. bring about C. bring out D. bring up

　　57. The university has launched a research center to develop new ways of _____ bacteria which have become resistant to drug treatments.

　　A. regulating B. halting C. interrupting D. combating

　　58. The _____ goal of the book is to help bridge the gap between research and teaching, particularly the gap between researchers and teachers.

　　A. joint B. intensive C. overall D. decisive

　　59. The rapid development of communications technology is transforming the _____ in which people communicate across time and space.

　　A. route B. transmission C. vision D. manner

　　60. When I go out in the evening I use the bike _____ the car if I can.

　　A. rather than B. regardless of C. in spite of D. other than

　　61. There is no _____ evidence that people can control their dreams, at least in experimental situations in a lab.

　　A. rigid B. solid C. smooth D. harsh

　　62. Every culture has developed _____ for certain kinds of food and drink, and equally strong negative attitudes toward others.

　　A. preferences B. expectations C. fantasies D. fashions

　　63. It is reported that Uruguay understands and _____ China on human rights issues.

　　A. grants B. changes C. abandons D. backs

　　64. Only a few people have _____ to the full facts of the incident.

　　A. access B. resort C. contact D. path

　　65. His trousers _____ when he tried to jump over the fence.

　　A. cracked B. split C. broke D. burst

　　66. So far, _____ winds and currents have kept the thick patch of oil southeast of the Atlantic coast.

　　A. governing B. blowing C. prevailing D. ruling

　　67. The author was required to submit an _____ of about 200 words together with his research paper.

　　A. edition B. editorial C. article D. abstract