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

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

Our department（）courses in several foreign languages.

I could not persuade him to accept it,（）make him see the importance of it.

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