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

I could not persuade him to accept it,（）make him see the importance of it.

He will behave(crazy)（）if he drinks too much.

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

An explosion is a sudden increase in amount（）

Nobody knows how long and how seriously the shakiness（不稳定） of big businesses will （） down the economy.

His company promised to pay for his health （）in addition to other benefits.

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

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

She is very nice, but because she has a（）way of speaking, she is slow in making friends