1.Good manners  add to your image 好的形象为你加分

2.I am at a loss for words. 我不知道该说什么了

3.The two spearkers are at loss what to do.(对话中)两人不知道怎么办好

4.She finished it at a stretch. 她一气呵成

5.How do you accont for the long delay? 你怎么解释这么长时间的延迟？

6.As far as i know whether there will be such a trip is yet to be decided.

据我所知，是否会有这样一场旅行仍待决定

7.While he has been doing this,he has been learning other things as well

他在做这件事的同时，还一直在学习其他的东西。

8.