—_______ I return your English book?—No, you _______.A. Must; mustn’tB. Could; can’tC. Must; needn’t
— ____ will you finish your homework? — In half an hour.
— Your parents have never learned English, _____? — Yes, they learned a little.
— Sixteen –year-olds should ____ to drive.
_____ my uncle _____ my aunt are reporter.
—If there are _____ people driving, there will be ____ air pollution. — Yes , the air around us will be fresher and cleaner.