85　in the red 赤字 反义：in the black

    86　in the works 正在准备阶段

    An advanced course in theoretical chemistry is the works.

    87　 keep to oneself

    I‘m amazed that you still haven’t gotten to know your neighbors.

    88　kill time 浪费时间

    Gosh， what can we do to kill the next 10 hours？

    89　leave…up to somebody

    We‘ll have to leave the decision up to him.

    90　letter of recommendation 推荐信；letter of reference 推荐信

    91　 look on the bright sides of things 看事物的光明面

    92　no kidding 不是开玩笑吧

    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！

    94　quitting time 下课时间

    I‘m glad it’s almost quitting time.

    95　 take it over 重修

    Don failed physics and had to take it over.

    96　than necessary 比应该的要冷

    The lab was cooler than necessary.

    97　 That‘s easer said than done. 说来容易做来难

    98　There is nothing to it. 没什么，很容易

    I can run this projector. There‘s really nothing to it.

    99　with flying colors 成功

    A： How did Ellen do on her American History exam？

    B： She passed with flying colors.

    100　You can bet your life 当然

    A： Will Prof. Smith come to class on time？

    B： You can bet your life.