1 . —_______ were you absent from the lecture yesterday?
— I caught a cold.

A．Where

B．When

C．Why

D．How

2 . After graduation, I took some time off to go travelling, ______turned out to be a wise decision.

A．that

B．which

C．when

D．where

3 . You are always looking for your keys. Remember to leave things ______ you can find them next time.

A．what

B．which

C．where

D．how

4 . Eventually, the butterfly manages to reach the places ______ it will spend the winter.

A．which

B．what

C．where

D．that

5 . When you read the book, you’d better make a mark ________ you have any questions.

A．which

B．that

C．though

D．where

6 . I don’t know the reason       he was late again.

A．why

B．where

C．which

D．that

7 . People began looking around to see ________ the noise was coming from.

A．how

B．why

C．whether

D．where

8 . Earth is a rocky planet _______ liquid water, which is necessary for life, can exist.

A．as

B．which

C．where

D．when