Trees can prevent the wind _____ towards the rich farmland in the south.
A. moves B. to move C. from moving
—Noise is _____to human’s health.
—Yes, we shouldn’t talk loudly in public.
A. harmful B. harm C. harmless
— Would you please tell us _____?
—In half an hour, I think.
A. when will he come back
B. when he will come back
C. when he came back
—Mrs White always helps others _____ she is very busy. —She is so kind.
A. but B. because C. although
—The population of the world ____ still ____ now.
—So it is.
A. are; growing B. will; grow C. is; growing
—It smells terrible. What has happened here?
—Look, there is a chemical factory_____ much waste gas.
A. pour B. pouring C. poured
