You must raise your hand if you have any questions in class．_________， your teacher won't notice you．（ ）
A．OtherwiseB．AnyhowC．InsteadD．Moreover
We be too careful while dealing with these social problems.
| A．may not | B．needn’t |
| C．cannot | D．mustn’t |
——He can write well.
——He_____, but he doesn’t. He’s too lazy.
| A．must | B．mustn’t |
| C．can | D．can’t |
Rick has learned a lot about Chinese culture _____ he came to China.
| A．before | B．when |
| C．until | D．since |
--Sorry, I overslept. I forgot to set the alarm.
--Your clock ________. Perhaps you should buy a new one.
| A．never worked | B．never works |
| C．had never worked | D．is never working |
Be quick, we’ll be late for the meeting.
| A．and | B．but |
| C．so | D．or |