An explosion is a sudden increase in amount（）

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

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

I tried very hard to persuade him to join our group but I met with a flat（）

He never（）to read the news but turned at once to the crossword puzzle on the last page.

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

The aircraft vanished without（）

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

Our department（）courses in several foreign languages.

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