1 . It is global warming, rather than other factors, ________ the extreme weather.

A．that have led to	B．which has caused
C．which are causing	D．that has led to

2 . ---________ has brought about the improvement of Chinese farmers’ living standards?
---The Party’s social benefiting policies, of course．

A．What is it that	B．What it is that
C．What is that	D．What is it

3 . It was not until I was chosen monitor of the class ________ to realize the importance of teamwork.

A．did I come	B．had I come.
C．when I came	D．that I came

4 . ---______ he managed to solve the problem?
---Oh，he turned to Professor Lee for advice.

A．Was it how that	B．Was it that how
C．How was it that	D．How it was that

5 . It was 80 years before Christopher Columbus crossed the Atlantic 　　　 　 Zheng He had sailed to East Africa.

A．when	B．that
C．after	D．since

6 . It was between 1830 and 1835 ______ the modern newspaper was born.

A．how

B．that

C．which

D．because

7 . It is exactly _____________he often fails in the exam ____________ makes his parents worried about him.

A．what; that	B．that; which
C．that; that	D．what; what

8 . — _______ you got to know my telephone number?
— Through a friend of yours.

A．How was it

B．How was it that

C．Was it how that

D．How did

9 . I just don’t understand ______ that leads to so many teenagers becoming addicted to playing computer games.

A．why it does

B．what it does

C．what it is

D．why it is

10 . I don’t mind her criticizing me, but___is how she does it that I object to.

A．it	B．that
C．this	D．which