If H2 burn in O2, we can get _____.
A．H2 B．H2O C．O2 D．H2O2
I’d like some _______ and _______.
A．tomatoes; muttons B．tomatoes; mutton
C．tomatos; muttons D．tomato; mutton
.—His father ______an actor , didn't he ? —Yes, he did .
A．used to being B．used C．used to be D．uses to be
I didn't sell it. I _______it________.
A．put…up B．put…on C．put …down D．give …away
The little boy is very brave. He ____ through the jungle with us last week.
A．trek B．treked C．trekes D．trekked
We find _____ important to use a foreign language well.
A．that B．it C．this D．its
