A. in the places

　　B. in place

　　C. in the place

　　D. in places

　　15. The price of apples is about four yuan per kg ______ average.

　　A. on

　　B. at

　　C. in

　　D. from

　　16. The ______ family in Chinese cities now spends more money on housing than before.

　　A. normal

　　B. average

　　C. usual

　　D. general

　　17. I have been having violin lessons ______, but I think I’ll make it every week from next month.

　　A. every other weeks

　　B. every second weeks

　　C. every two week

　　D. every two weeks

　　18. We were asked to plant a tree ______ on both sides of the road.

　　A. every twenty meter

　　B. every twentieth meters

　　C. every twentieth meter

　　D. every other twenty meter

　　19. Miss Gao asked a question, but it was ______ that nobody could answer it.

　　A. very difficult

　　B. too difficult

　　C. difficult enough

　　D. so difficult

　　20. We made up our minds to study hard ______ we could be admitted into university.

　　A. in order to

　　B. all that

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