1.let the cat out of the bag 泄漏秘密 (来源：英语麦当劳－英语学习门户 http://www.EnglishCN.com)

     I won't let the cat out of the bag.

     我不会泄漏秘密的。

     2.in the market for 想买，积极物色

     People are always in the market for something new and different.

     人们总想买点新奇的且与众不同的东西。

     3.meddle in 干涉，搅和

     Harold asked his boss stop meddling in his personal life.

     哈罗德要求老板别再干涉他的私生活。

     4.screw loose脱线，神经不对头

     Bill must have a screw loose somewhere; he's acting really strangely.

     Bill一定是哪根筋不对，他的行动真奇怪。

     5.sell someone on 以...说服某人

     She sold me on her idea. I think it will work.

     她用她的看法说服了我，我想那行得通。