51. Wait till you are more ________. It's better to be sure than sorry.

　　A. cautious B. confident C. calm D. certain

　　52. The job is __________ to me because I have little experience. However, it is also rewarding.

　　A. challenging B. boring C. bitter D. contradictory

　　53. The weather here is too _______ and it can rain at any moment. Why not bring an umbrella?

　　A. comfortable B. consistent C. changeable D. bitter

　　54. With the development of West China, many technicians are _________ needed there in recent years.

　　A. cautiously B. casually C. badly D. barely

　　55. It’s believed that the two accidents are ________ related to each other.

　　A. closely B. close C. commonly D. deeply

　　56. I don’t like winter, because I hate to wear _________ clothes.

　　A. casual B. comfortable C. changeable D. clumsy

　　57. Letterboxes are much more _________ in the UK than in the US, where most people have a mailbox instead.

　　A. common B. normal C. ordinary D. bare

　　58. Many people ask the government to make laws to _________ smoking in public places.

　　A. ban B. benefit C. limit D. permit

　　59. If children were not told and shown how to __________ politely, they might grow up rough and rude like savages (野人).

　　A. blame B. behave C. betray D. bow

　　60. The old man is used to sleeping without a pillow in order to keep his back from _________.

　　A. bending B. bowing C. breaking D. bouncing

　　61. The social activities have __________ the building up of the children’s characters and the development of their personalities.

　　A. boycotted B. braked C. bidden D. benefited

　　62. Think of others first when it comes to benefits. Never _________ others for your own gains.

　　A. boycott B. benefit C. betray D. believe

　　63. His attitude to his job is rather casual. He should be to _________ for his fault.

　　A. bid B. blame C. bother D. cater

　　64. As the only entrance to the valley was __________ by fallen rocks, we couldn’t gain access to the village to rescue the trapped people.

　　A. blocked B. braked C. bothered D. buried

　　65. I'm very sorry to have _______ you with so many questions on such an occasion.

　　A. interrupted B. offended C. blamed D. bothered

　　66. The ball _____ two or three times before rolling down the slope.

　　A. bent B. bounced C. broke D. braked

　　67. We ______ all products tested on animals. It is so cruel.

　　A. boycott B. calculate C. block D. bury

　　68. The trip to Australia, originally to be made last week, was finally _________ for the lack of money.

　　A. boycotted B. calculated C. canceled D. cast

　　69. Don’t ________ away your old clothes. If you don’t need them, you can donate them to the poor.

　　A. carry B. waste C. spend D. cast

　　70. I don’t think he is a good writer; he specially writes books to ________ to low tastes.

　　A.blame B. cater C. cancel D.charge

　　71. Every year on 28th, September, many people gather in Qufu to _________ Confucius's birthday, paying their respects.

　　A. celebrate B. calculate C. congratulate D. welcome

　　72. She was complaining that the doctor was _________ too much for the treatment he was giving her.

　　A. spending B. offering C. costing D. charging

　　73. Schools ban students from bringing mobile phones, which are used to _______ in exams.

　　A. cheat B. boycott C. charge D. click

　　74. --- Julia said she sent you a birthday card yesterday. Have you got it?'

　　--- Oh, really! I haven't __________ my mailbox yet.

　　A. examined B. calculated C. tested D. checked

　　75. He _________ over the problem for several days before making his decision.

　　A. checked B. chewed C. catered D. choked