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

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

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

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

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.

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

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

I was（）than angry when I saw how they'd ruined the landscape.

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