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

The aircraft vanished without（）

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

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

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

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

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

An explosion is a sudden increase in amount（）

He（）for military service against the wishes of his parents.

The noise of the traffic（）Paul from his work.