If we don’t study hard, we will ______in our class.
| A．take the lead | B．be the first |
| C．fall behind | D．be successful |
—Watching TV too much _______ bad for your eyes.
—OK. I’ll go to bed right away.
A.is B.are C.was
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