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　　　　( )21. Tom has been in the factory _________he left school.

　　　　A. when B. since C. as soon as D. whether

　　　　( )22. The nurse doesn't feel well today, _________ she still works very hard.

　　　　A. but B. and C. or D. when

　　　　( ) 23. _______ my mother ________ my sister watches TV plays these days.

　　　　A. Either, nor B. Both, and C. Neither, or D. Neither, nor

　　　　( ) 24. He walked ________ fast for us ________catch up with.

　　　　A. so, that B. such, that C. enough, to D. too, to

　　　　( ) 25. Lucy knew nothing about it ________ her sister told her.

　　　　A. because B. until C. if D. since

　　　　( ) 26. I don't think it very expensive to buy a family computer here.

　　　　-- Really? I'll buy _______ next week.

　　　　A. it B. this C. one D. mine

　　　　( ) 27.--Which would you like, rice or noodles? --_______is OK. I'm hungry.

　　　　A. Either B. Neither C. Both D. All

　　　　( ) 28. We found ________ necessary to protect the environment.

　　　　A. it B. this C. that D. what

　　　　( )29. The weather in Beijing is cooler than ________ in Guangzhou.

　　　　A. this B. it C. that D. one

　　　　( )30. There is _________in today's newspaper.

　　　　A. new anything B. new something C. anything new D. something new

　　　　答案：21-30: BADDB CAACD