16. Studies will be needed to see if the medicine has any     on the disease.

　　A. wealth

　　B. effect

　　C. price

　　D. market

　　7. The students sat under a big tree,     cold orange juice.

　　A. drink

　　B. drank

　　C. to drink

　　D. drinking

　　18.The girl who     by a falling tree is now in the hospital.

　　A. hit

　　B. has hit

　　C. has been hit

　　D. was hit

　　19. You could look for a job in big cities     workers are better paid.

　　A. where

　　B. when

　　C. whose

　　D. that

　　20. 1 don't remember who spoke first that night,but all of us       the same opinion.

　　A. are expressing

　　B. have expressed

　　C. expressed

　　D. express

　　参考答案：

　　1.D   2.A   3.C   4.C  5. D   6.B   7.A   8.C   9.A   10. B

　　11.C   12.B   13.C   14.D  15.C   16.B   17.D   18.D   19.A    20.C

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