Nobody knows how long and how seriously the shakiness（不穩(wěn)定） of big businesses will （） down the economy.

The aircraft vanished without（）

Many students found the book （）;it provided them with a large amount of information on the subject.

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

The survivors（）to a floating tree in hopes of rescue.

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

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

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

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

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