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

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

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

His company promised to pay for his health （）in addition to other benefits.

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