An explosion is a sudden increase in amount（）

The aircraft vanished without（）

Our department（）courses in several foreign languages.

I want you to succeed without（）and firmly believe that you will succeed if you try hard enough.

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

I just managed to（）a quick breath before I was pulled under the water by the passing boats.

We forgave her anger because we knew that her father's illness had put her under great （）

I expected a bigger payment, but I suppose you have to be（）for small mercies.

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

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