Something must be done to prevent our city ____ by thick smoke.
| A．to be polluted | B．from polluting | C．from being polluted | D．polluting |
I have $20 000 and I need $25 000,but my parents have promised to _______ the difference.
| A．work out | B．come up | C．give out | D．make up |
It was a pity that the great writer died _______ his works unfinished.
| A．for | B．with | C．from | D．of |
After _______ absence of 10 years from his hometown, Mr. Li doesn't know _______ great changes have taken place there.
| A．an;/ | B．an; the | C．the; a | D．/;the |
As a rough estimate, Nigeria is _______ Great Britain.
| A．three times the size as | B．the size three times of |
| C．three times as the size of | D．three times the size of |
_______from the top, the 2008 Olympic stadium in Beijing looks just like a bird's nest made of tree branches.
| A．To see | B．See | C．Seeing | D．Seen |