—Hey，you haven't been acting like yourself．Everything is OK?
— .
| A．Sure, it is | B．I'm fine，thanks | C．That's good | D．It's a pleasure |
-I think I'll give Bob a ring.
-You __________. You haven't been in touch with him for ages.
| A．will |
| B．may |
| C．have to |
| D．should |
-What do you think we can do for our aged parents?
-You __________ do anything except to be with them and be yourself.
| A．don't have to |
| B．oughtn't to |
| C．mustn't |
| D．can't |
I can't leave. She told me that I __________ stay here until she comes back.
| A．can |
| B．must |
| C．will |
| D．may |
I __________ use a clock to wake me up because at six o'clock each morning the train comes by my house.
| A．couldn't |
| B．mustn't |
| C．shouldn't |
| D．needn't |
-__________ you interrupt now? Can't you see I'm on the phone?
-Sorry Sir, but it's urgent.
| A．Can |
| B．Should |
| C．Must |
| D．Would |