Something must be done to prevent our city ____ by thick smoke.
| A．to be polluted | B．from polluting | C．from being polluted | D．polluting |
. They ______ to accept me as a full-time student of their university.
| A．rejected | B．refused | C．turned down | D．said no |
No sooner ________in the distance ______a storm began to pour.
| A．a thunder broke; when | B．a thunder had broken; than |
| C．had a thunder broken; than | D．did a thunder break; than |
The CDs are on sale！Buy one and you get ______ completely free.
| A．other | B．others | C．one | D．ones |
It’s no use____ that you didn’t know the rules.
| A．you pretend | B．you to pretend | C．of you to pretend | D．your pretending |
. At a rough estimate（估计）, Nigeria is ____ Great Britain.
| A．three times the size as | B．the size three times of |
| C．three times the size of | D．three times as the size of |