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

An explosion is a sudden increase in amount（）

Shall we request the chairman（）our suggestion again?

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

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

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

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

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

（）students often find it difficult to live in China at first.

The aircraft vanished without（）