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 . 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

3 . _____ 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

4 . 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

5 . 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

6 . I had great difficulty      the suitable food on the menu in that restaurant.

A．find

B．found

C．to find

D．finding

7 . _______ makes the school proud was ______ more than 90℅ of the students had been admitted to key universities.

A．What; because

B．What; that

C．That; what

D．That; because

8 . One reason for her preference for city life is ___________ she can have easy access to places like shops and restaurants.

A．that

B．how

C．what

D．why

9 . We haven’t discussed yet ________ we are going to place our new furniture

A．that

B．which

C．what

D．where

10 . Not only __________ to London but also he worked there for two years.

A．had he been	B．he traveled
C．he has been	D．he went