---Excuse me, Sir .But smoking is not allowed here.-----Sorry,I didn’t see the sign.I’ll __________ my cigarette at once.
—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 backB. when he will come backC. 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