1.we were all at sea as to what to do next.

2.bring on：致使

3.bring in：引进、产生利润

4。break off：弄断、折断

5。break up：分手

6.break out：爆炸

7.at the mercy of circumstance：被环境支配

8.avail of：avail yourself of this oppoturnity to study abroad.

9.answer back：驳嘴

10.a handful of：少量

11。gets done up：盛装打扮

12。get with  it：小心

13。went halves on a present for her.

14.pull rank:指「（某人）利用其身分或地位的優勢去得到優勢，或是迫使其下面的人服從」
The president of the company pulled rank and told his employees to cancel the product.

15.it's now or never

16.account for:解释，说明

17。add up：合情合理

18。fit the bill：合适，正正需要

19。out of line:过份

20。The bus runs from 9 a.m. to 11 p.m., every hour on the hour.