为帮助大家在轻松愉快的氛围中掌握英语基础知识，本网站特提供以下资料，希望会带给你意想不到的收获：
41. As a _____ actor， he can perform， sing， dance and play several kinds of musical instruments.
A. flexible
B. versatile
C. sophisticated
D. productive
正确答案是
42. As a salesman， he works on a (an) _____ basis， taking 10% of everything he sells.
A. income
B. commission
C. salary
D. pension
正确答案是
43. As an excellent shooter， Peter practiced aiming at both _____ targets and moving targets.
A. stationary
B. standing
C. stable
D. still
正确答案是
44. As teachers we should concern ourselves with what is said， not what we think _____.
A. ought to be said
B. must say
C. have to be said
D. need to say
正确答案是
45. As the plane was getting ready to take off， we all _____ our seat belt.
A. tied
B. locked
C. fastened
D. closed
正确答案是
46. At first， the speaker was referring to the problem of pollution in the country， but halfway in her speech， she suddenly _____ to another subject.
A. committed
B. switched
C. favored
D. transmitted
正确答案是
47. At no time _____ other countries.
A. China will invade
B. will invade China
C. will China invade
D. invade will China
正确答案是
48. Be here on Friday _____ the latest.
A. at
B. by
C. for
D. in
正确答案是
49. Because the whole country is in a financial dilemma， the government calls on us to _____ economy.
A. make
B. practice
C. carry
D. develop
正确答案是
50. Before he started the work， I asked the builder to give me an _____ of the cost of repairing the roof.
A. assessment
B. estimate
C. announcement
D. evaluation
正确答案是
41. B 42. B 43. A 44. A 45. C 46. B 47. C 48. A 49. B 50. B
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