1 . I just don’t understand _______ that prevents so many Americans from being as happy as one might expect.

A．why it does	B．what it does
C．what it is	D．why it is

2 . It ___ we had stayed together for a couple of weeks _____I found we are very different people．

A．was until; when	B．was until; that
C．wasn’t until; when	D．wasn’t until; that

3 . It is the discovery of Cao Cao’s tomb, _____ was made in Anyang, Henan province, ____ has received widespread attention．

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

4 . I have already forgotten ______ you bought the computer.

A．that it was when	B．that it was what
C．what it was that	D．when it was that

5 . Is it ________ he wanted to study abroad ________ made his parents work harder than before in order to make more money?

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

6 . It was in the very house _____ was built with stones _____ he spent his childhood.

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

7 . The police were seeking more information to find out________ killed the rich merchant.

A．who it was that	B．who was it that
C．it was who	D．who was it

8 . I just wonder ________ that makes you so excited.

A．why it does	B．what it does
C．how it is	D．what it is

9 . It is the interaction between people, rather than the events ___ occur in their lives, ____ is the main focus of social psychology.

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

10 . —_____ that he picked up his uncle at the airport?
—It was at 6:00 in the afternoon _____ he got off work.

A．Was it when; that

B．When was it; that

C．Was it when; when

D．When was it; when