Sam spends two hours _______ his homework every day.
| A．to do | B．doing |
| C．do | D．does |
Everyone knows that a desk is made __ wood and paper is made__ wood too.
A. of , of B. of , from C. from, of
I’ m sure I can make myself _____, because I have improved my English greatly.
A. understand B. understanding C. Understood
The river has become much ______ than before because of the waste water.
A. dirty B. dirtier C. Dirtiest
----Do you know how the accident _______?
----Sorry, I don’t know.
A. come out
B. come into being
C. come about
-----I wish I _____ go into space some day.
----- I hope your dream _____ true.
A. could , will come
B. can , came
C. can , will come