is dangerous _____ play football in the street.
If it _______ tomorrow, we will go mountain climbing.A.isn’t rain B.don’t rain C.doesn’t rain
—May I use your bicycle, Lily?—Sure, _______.A. here you are. B.you can ask Bill C.you can’t
—Would you please _______ near the river?—Oh, sorry, I won’t.A. not play B.don’t play C. not to play
—Must I take the medicine every day?—No, you _______.A.must B.mustn’t C.needn’t
—Excuse me, can you do me a _______?—Sure.A.hand B.help C. favor