1 . An accident happened on the main road. That is ______ traffic seemed to slow suddenly.

A．why	B．how
C．when	D．what

2 . — The rent of our flat will see a 20% rise this year?
— Yes. That’s ______ I have compromised with the flat owner.

A．what	B．where
C．how	D．when

3 . Ensuring every child equal rights to education is _____the key to the elimination of inequality across the world lies.

A．that

B．what

C．whether

D．where

4 . －How do you usually find out about new software?
－In the magazines like Popular Electronics. That’s______computer companies usually advertise.

A．which

B．where

C．what

D．why

5 . The last time we had great fun was __________ we were visiting the Water Park.

A．where

B．how

C．when

D．why

6 . The world is not always ______we wish it to be.

A．that	B．which
C．what	D．where

7 . Self-confidence is a kind of quality and that is            it takes to do everything well.

A．why	B．that
C．what	D．which

8 . With many cities in China dreadfully blanketed by thick haze, the environmental problem is _____ Chinese people concern most nowadays.

A．what

B．which

C．where

D．when

9 . (2015·安徽)A ship in harbor is safe, but that’s not _____________ ships are built for.

A．what	B．whom
C．why	D．when

10 . — Do you like the book you father bought you?
— Very much. It’s exactly______I wanted.

A．which	B．that
C．what	D．how