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

An explosion is a sudden increase in amount（）

The aircraft vanished without（）

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

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

He（）for military service against the wishes of his parents.

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

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

Our department（）courses in several foreign languages.

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