Nobody knows how long and how seriously the shakiness（不穩(wěn)定） of big businesses will （） down the economy.

I expected a bigger payment, but I suppose you have to be（）for small mercies.

Many students found the book （）;it provided them with a large amount of information on the subject.

The price they offered for my old car was so low that I（）it down.

Our department（）courses in several foreign languages.

After she became a lawyer, she decided to （）criminal law.

The survivors（）to a floating tree in hopes of rescue.

Since we can't hear you at the back of the hall, you'll have to（）your voice.

The noise of the traffic（）Paul from his work.

I don't know who on（）stole the diamond last night.