21, I have seen worse 我见过更糟的
22, in advance 提前;同义：before hand, ahead of time
It’s a really nice apartment. But the owners want two-month rent in advance and I just don ’t have it.
23, in case 万一
Let’s take our suits along in case the sun comes out.
24, in next to no time 马上
A: Are you going to be using the copying machine long?
B: I’ll be through in next to no time.
25, in the red 赤字反义：in the black
26,in the works 正在准备阶段
An advanced course in theoretical chemistry is the works.
27, keep to oneself
I’m amazed that you still haven’t gotten to know your neighbors.
28, kill time 浪费时间
Gosh, what can we do to kill the next 10 hours?
29, leave…up to somebody
We’ll have to leave the decision up to him.
30, letter of recommendation 推荐信;letter of reference 推荐信