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

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

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

The aircraft vanished without（）

After she became a lawyer, she decided to （）criminal law.

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

Our department（）courses in several foreign languages.

Shall we request the chairman（）our suggestion again?

An explosion is a sudden increase in amount（）

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