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

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

People appreciate（）with him because he has a good sense of humor.

Some say yes and others say no; I don't know （）to follow.

Inquiries（）the condition of the patients may be made personally or by telephone.

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

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

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

An explosion is a sudden increase in amount（）

I tried very hard to persuade him to join our group but I met with a flat（）