The aircraft vanished without（）

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

Mr. Edward was not in, so his brother acted as （）at the party.

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

Inquiries（）the condition of the patients may be made personally or by telephone.

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

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

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

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

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