Nobody knows how long and how seriously the shakiness（不稳定） of big businesses will （） down the economy.

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

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

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

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

He will behave(crazy)（）if he drinks too much.

He never（）to read the news but turned at once to the crossword puzzle on the last page.

The price they offered for my old car was so low that I（）it down.

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

I want you to succeed without（）and firmly believe that you will succeed if you try hard enough.