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

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

Mr. Edward was not in, so his brother acted as （）at the party.

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

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

Shall we request the chairman（）our suggestion again?

Our department（）courses in several foreign languages.

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

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

An explosion is a sudden increase in amount（）