11.Be in a black mood 情绪极差
　　To be so negative about everything that it is impossible for anyone to reason with him/her
　　Example: My father has been in a black mood for days, we dare not say anything to him.

12.Feeling blue 感到无精打采
　 Feeling sad or depressed
Example: she's feeling blue because of sadness.

13.New blood 新成员
　　New people brought into an organization to introduce different and original ideas
　　Example: It was decided to bring new blood into the school by employing teachers with the latest training.

14.Get to the bottom of something 弄清真相
　　To find out the truth about something
　　Example: I'm trying to get to the bottom of why David left without saying goodbye.

15.A piece of cake 轻松的事
　　Something which is very easy to do
　　Example: Here…let me put the batteries in for you. It's a piece of cake.

16.Pay a call 拜访
　　To visit somebody
　　Example: As we're in this neighborhood, we might as well pay the Jacksons a call, we haven't seen them for ages.

17.Round the clock 夜以继日的
　　To do something continuously, without a break or pause
　　Example: The ambulance services worked round the clock hauling people trapped in the building to safety.

18.By chance 偶然，意外的
　　Unexpectedly; with no prior planning
　　Example: By chance, I bumped into my wife in the shopping mall

19.Keep one' cool 保持冷静
　　To stay calm in a difficult situation
　　Example: If the traffic is jamed, the only thing to do is keep your cool, or get out of the car and walk!

20.In a tight corner 处于困境
　　In an extremely difficult situation
　　Example: Whenever I get into a tight corner, I try to rely on quick thinking to get out of it.