.The police an organization which protects the public from harm .
| A．are | B．was | C．were | D．is |
Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.
| A．a; a | B．a; the | C．不填; a | D．the; 不填 |
—How about __________ Christmas evening party?
—I should say it was __________ success.
| A．a; a | B．The; a | C．a; 不填 | D．the; 不填 |
I looked under __________ bed and found __________ book I lost last week.
| A．the; a | B．the: the | C．不填; the | D．the; 不填 |
Students should be encouraged to use _____ Internet as _________ resource.
| A．不填; a | B．不填; the | C．the; the | D．the; a |
The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of ____ 9-story building.
| A．the; the | B．a; a | C．a; the | D．the; a |