A. 单项选择：从A、B、C三个选项中选出可填入空白处的最佳答案。(每 小题1分)
31. English is spoken as _________language in some countries.
A. the second B. a second C. second
32. —Forests are very important to us，aren't they?
—Yes，they can prevent water from ____________the earth away.
A. wash B. washing C. to wash
33. —Who helped you mend the kitchen fan yesterday?
—________. I mended it all by myself.
A. Somebody B. Nobody C. Anybody
