— Must we finish all the exercises today?
— No, you ________.You can finish them within two days.
| A．mustn’t | B．needn’t to | C．needn’t | D．don’t have |
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