1 . The true value of life is not               but what you have done. (gain)
生命的真正价值不在于你得到什么，而在于你做过什么。

2 . Jim fell asleep in the math class today. That is ___________ he stayed up until midnight doing his homework.

3 . Whether ways will be found to stop pollution or not is just _____ worries the public. （用适当的单词填空）

4 . What has caused great confusion is ____________ the scientist made it without anyone else’s help. (用适当的词填空)

5 . Education is ______________ survives when knowledge taught in class has been forgotten.

A．how

B．who

C．what

D．which

6 . Social media paints this rosy picture that everyone else 's lives are perfect,but things are seldom_______they seem.

A．which

B．what

C．how

D．where

7 . As days go on，I think that Beijing will become ________ the whole world pay close attention to.

A．where

B．what

C．which

D．that

8 . It is years since he worked here, but his devotion to his work is________we often hear Spoken of.

A．what

B．that

C．when

D．why

9 . He studied hard and later became a well-known writer, which was ______ his father had expected.

A．why

B．how

C．that

D．what

10 . The combination of economic and career opportunities and sponsorship for studying abroad is _____ lies behind the reversal of China's brain drain.

A．that

B．what

C．where

D．why