An explosion is a sudden increase in amount（）

Our department（）courses in several foreign languages.

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

The aircraft vanished without（）

The weakening housing market continued to take its（）on the industry.

I don't know who on（）stole the diamond last night.

The student's first attempt at writing a play was a far（）from the work of Shakespeare.

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

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

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