I very busy studying for my exams since last month．（ ）
| A． |
am |
B． |
was |
C． |
will be |
D． |
have been |
---Will you please stay here for the party?
---Sorry, I _____. I have to go to visit my grandfather in hospital.
| A．mustn’t | B．needn’t |
| C．can’t | D．won’t |
The notebook ___________ be John's ．There is his name on it．
| A．must | B．might |
| C．could | D．can't |
-- 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 |