51. I hadn' t seen him for years, but I __________his voice on the telephone.
　　A. realized
　　B. discovered
　　C. recognized
　　D. heard
　　52. This place, originally a small town, has been__________ into a modem city.
　　A. transported
　　B. transferred
　　C. transmitted
　　D. transformed
　　53. There was nobody__________ when we came round the comer.
　　A. out of sight
　　B. at sight
　　C. by sight
　　D. in sight
　　54. They couldn' t __________him of his mistake.
　　A. advise
　　B. convince
　　C. persuade
　　D. believe
　　55. We look forward to__________ to the opening ceremony.
　　A. invite
　　B. be invited
　　C. having been invited
　　D. being invited
　　56. In winter, animals have a hard time __________anything to eat.
　　A. to find
　　B. to finding
　　C. to find out
　　D. finding
　　57. Since you won' t take advice, there is no__________ in asking for it.
　　A. place
　　B. point
　　C. reason
　　D. way
　　58. They have developed techniques which are __________to those used in most factories.
　　A. more
　　B. better
　　C. greater
　　D. superior
　　59. History is the story of__________ happened to the people before today.
　　A. whichever
　　B. whomever
　　C. whatever
　　D. wherever
　　60. The teacher asked his students to leave enough __________on the page for correction.
　　A. room
　　B. margin
　　C. place
　　D. paper

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