86,in the works 正在准备阶段
??An advanced course in theoretical chemistry is the works.
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??87, keep to oneself
??I’m amazed that you still haven’t gotten to know your neighbors.
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??88, kill time 浪费时间
??Gosh, what can we do to kill the next 10 hours?
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??89, leave…up to somebody
??We’ll have to leave the decision up to him.
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??90, letter of recommendation 推荐信；letter of reference 推荐信
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??91, look on the bright sides of things 看事物的光明面
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??92, no kidding 不是开玩笑吧
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??93, on the tip of one’s tongue 就在舌尖
??A: Are you sure you can’t remember the name of that record?
??B: It’s just on the tip of my tongue!
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??94, quitting time 下课时间
??I’m glad it’s almost quitting time.
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??95, take it over 重修
??Don failed physics and had to take it over.
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??96, than necessary 比应该的要冷
??The lab was cooler than necessary.
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??97, That’s easer said than done. 说来容易做来难
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??98, There is nothing to it. 没什么，很容易
??I can run this projector. There’s really nothing to it.
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??99, with flying colors 成功
??A: How did Ellen do on her American History exam?
??B: She passed with flying colors.
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??100, You can bet your life 当然
??A: Will Prof. Smith come to class on time?
??B: You can bet your life.