He prefers___indoors____out this afternoon.
| A．to stay;to go | B．staying; to going | C．staying;to go | D．to stay; going |
We must do what we can to ____________the river ______________.
| A．protect; against polluting | B．stop; polluting |
| C．keep; being polluted | D．prevent; from being polluted |
Paper produced every year is _______________the world`s production of vehicles.
| A．three times the weight | B．the three times weight |
| C．as three times heavy as | D．three times as heavier as |
—A second, please. I have another call coming through.
—_____. I’m not in a hurry.
| A．Enjoy yourself. | B．Leave me alone. | C．Why not. | D．Take your time. |
He has to finish the experiment today. He must be in the lab, ______?
| A．mustn’t he | B．won’t he | C．doesn’t he | D．isn’t he |
Not far from the school there was a garden, _____ owner seated in it playing chess with his grandson every afternoon.
| A．its | B．whose | C．which | D．that |