My classmate is running so fast!I ________ believe my eyes.
A.can'tB.needn'tC.mustn'tD.shouldn't
We be too careful while dealing with these social problems.
——He can write well. ——He_____, but he doesn’t. He’s too lazy.
Rick has learned a lot about Chinese culture _____ he came to China.
--Sorry, I overslept. I forgot to set the alarm. --Your clock ________. Perhaps you should buy a new one.
Be quick, we’ll be late for the meeting.