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

The aircraft vanished without（）

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

I tried very hard to persuade him to join our group but I met with a flat（）

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

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

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

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

I don't know who on（）stole the diamond last night.

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