D. protecting

　　解析：1.spend as much time/money as one can doing sth. “花尽可能多的时间或金钱来做某事。”答案：C

　　变式1. do everything one could to do “尽力去做某事”答案：A

　　This kind of food is fit ____ , and it is _____.

　　A. to eat;

　　tasted

　　B. for eating ; tasty

　　C .to eat ;

　　tasty

　　D. to be eaten; tasting

　　变式1. He managed to keep —— by getting up earlier.

　　A. fit

　　B. suitable

　　C. suited

　　D. heath

　　变式2. Let’s go for a swim and will Friday _____ you?

　　A. fit

　　B. suit

　　C. suited

　　D. suited

　　解析：2. sth. be fit 后接不定式时要用主动表示被动，第二空用tasty来做表语。答案：C。

　　变式1. keep fit “保持健康”fit为形容词在keep的表语。答案：A

　　变式2.. 考查suit和fit 的区别,suit可以指合某人的心意，对某人来说方便。答案：B

　　3. You must double your efforts to ____ others and can’t expect to take short-cuts in the learning of English. A. keep up with B. keep up C. catch up with D. keep you up A. keep up with B. keep up C. catch up with

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