---May I go out to play with my friends now, Dad?---No. You ______ let your mother know first.A. may B. need C. must
—Is Jack in the classroom now? —No, he football on the playground.
—Where is your brother?—He has gone to Beijing. He back in three days.
—Ann, I am worried I’m getting fatter. What shall I do?—I think you should eat ________ food and do more exercise.
—Why don’t you buy the bike, Mary? — It’s too expensive. I can’t it.
they are twins, they don’t look the same at all.