—Must we keep the window _______ all the time?—No, you don’t have to.A.opening B.opened C. open
— Dad, my watch doesn’t work. — ___________ Let me see what I can do for you.
Mr. Brown said with a smile, “___________ your hands if you have any problem. ”
-Peter, don’t pick flowers in the park ! -__________. A. Sorry, I won’t B. Sorry, I don’t C. It’s nothing
-We __________ play football on the busy road, it’s dangerous. -I agree with you. We should keep safe. A. needn’t B. mustn’t C. may not
Going to school __________ breakfast is bad for our health. A. with B. without C. at