An explosion is a sudden increase in amount（）

She is very nice, but because she has a（）way of speaking, she is slow in making friends

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

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

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

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

She couldn't（）laughing at him in those clothes.

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

Anne（）from outside her home last Wednesday.

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