1. put two and two together根据事实推理

2 .two heads are better than one 两个臭皮匠胜过一个诸葛亮

3.there are no two ways about it (there is only one way to solve it.)别无他法

4.be of two minds左右摇摆，拿不定主意

5.in two shakes of a lamb's tail立刻

6.kill two birds with one stone.一石二鸟，一箭双雕

7.two wrongs don't make a right.两个错误不等于一个对

8.two's company,three's a crowd.两人成伴，三人不欢

9.three R's   小学所教的阅读，写作，算术等基础课

10.give three cheers to sb. 祝贺

11.at sixes and sevens乱七八糟

12.six of one,half a dozen the other. 半斤八两，一模一样

13.seventh heaven 七重天，极乐世界

14.on cloud nine.极快乐，狂喜

15.mine times out of ten.十有八九，大抵

16.nine-to-five job. 朝九五晚的工作

17.dress to the nines.穿着光鲜华丽，打扮得漂亮

18.a hundred to one. 百分之一，可能性较大

19.a million to one. 百万分之一，可能性较小

20.forty winks 白天小睡

21.the eleventh hour. 最后一刻，危急之时