1 . Wind power is an ancient source of energy ________ we may return in the near future.

A．on which

B．from which

C．by which

D．to which

2 . Jane is in a hurry because the train to the airport leaves _______ half an hour.

A．by	B．in
C．for	D．until

3 . The researchers who study jokes want to find out _______ people from different nations and cultures find funny.

A．why	B．that
C．what	D．whether

4 . _____ you may have, you should gather your courage to face the challenge.

A．However a serious problem	B．What a serious problem
C．However serious a problem	D．What serious a problem

5 . ---We want someone to design the new art museum for me.
---_____ the young fellow have a try?

A．Shall

B．May

C．Will

D．Need

6 . Teachers recommend parents ________ their children under 12 to ride bicycles to school for safety.

A．not allow	B．do not allow
C．mustn’t allow	D．couldn’t allow

7 . When changing lanes, a driver should use his turning signal to let other drivers know ______.

A．he is entering which lane	B．which lane he is entering
C．is he entering which lane	D．which lane is he entering

8 . When I got home I saw a message pinned to the door ____ “Sorry to miss you, will
call you later.”

A．read

B．reading

C．reads

D．to read

9 . Only when I left my parents for Italy ______ how much I loved them.

A．did I realize

B．I realized

C．had I realized

D．I had realized

10 . His first book ____ next month is based on a true story.

A．published

B．to be published

C．to publish

D．being published