The machine might break down someday in the future, ____, you can dial this number for help.
| A．in that case | B．in what case |
| C．in which case | D．in whose case |
Doctors say that exercise is important for health, but it ________ be regular exercise.
| A．can | B．will |
| C．must | D．may |
One of our rules is that every student ________ wear school uniform while at school.
| A．might | B．could |
| C．shall | D．will |
The new law states that people ________ drive after drinking alcohol.
| A．wouldn't | B．needn't |
| C．won't | D．mustn't |
—Good morning. I've got an appointment with Miss Smith in the Personnel Department.
—Ah, good morning. You ________ be Mrs. Peters.
| A．might | B．must |
| C．would | D．can |
It ________be the postman at the door.It's only six o'clock.
| A．mustn't | B．can't |
| C．won't | D．needn't |