Sarah _________many places of interest in Beijing already．（ ）
| A． |
visited |
B． |
has visited |
| C． |
will visit |
D． |
visits |
-- I think the red car _______ belong to Miss Wang because she bought a new car yesterday.
--It __________be her car’s because her new car is blue.
| A．must; can’t | B．may; mustn’t |
| C．can; mustn’t | D．must; needn’t |
------Must I finish my homework now ?
------No, you _________ . You can do it tomorrow .
| A．can’t | B．needn’t |
| C．mustn’t | D．must |
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 |