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

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

Mr. Sanders has been asked to（）the next meeting of the committee.

An explosion is a sudden increase in amount（）

In China,it is quite (nature)（） for people to go back home for the Spring Festival.

Our department（）courses in several foreign languages.

She had clearly no（）of doing any work, although she was very well paid.

Anne（）from outside her home last Wednesday.

I just managed to（）a quick breath before I was pulled under the water by the passing boats.

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