10　Kill two birds with one stone 一石二鸟

　　To complete two tasks together, with less effort than doing them separately

　　Example: Since I’d gone to the store to buy some bread, I thought of killing two birds with one stone and invited Mr. Biggs to the party.

　　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　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.

　　13　Feeling blue 感到无精打采

　　Feeling sad or depressed

　　Example: She’s feeling blue, because the man she loves is far away.

　　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　By chance 偶然, 意外的

　　Unexpectedly; with no prior planning

　　Example: By chance, I bumped into my wife in the shopping mall

　　18　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.

　　19　Keep one’s 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.