1 . A way to raise your spirits is to think of a situation ________ you did something you are proud of.

A．which

B．where

C．what

D．as

2 . There is a rule in the library that one is required to put the book ______ it is after finishing reading it.

A．what

B．how

C．where

D．when

3 . I was really excited about the plane trip ______ I got on the plane and saw the narrow space between the seats.

A．once

B．where

C．though

D．until

4 . When you visit Beijing, you can go to theaters and teahouses ________ you can experience a truly Chinese way of life.

A．that

B．which

C．where

D．when

5 . Don't waste time on jealousy, because life is a long race, ________   your only opponent is yourself in the end.

A．which

B．as

C．where

D．when

6 . ________ the PX project will be called off depends, for it still needs more research and discussion.

A．That

B．Whether

C．Where

D．What