— I can’t give up smoking, doctor.
For your health, I’m afraid you _______.
| A．may | B．can | C．have to | D．need |
--_________ I come back before five o’clock?
--No, you________. But you can’t be back later than seven o’clock.
| A．Need, must | B．may, mustn’t |
| C．Can, can’t | D．Must, needn’t |
---Must I tell Mike about it?
---No, you _______. He’s already been told.
| A．mustn’t | B．can’t |
| C．needn’t | D．shouldn’t |
We brush our teeth twice a day.
| A．may | B．can | C．should | D．shouldn’t |
My mother is ill. I ______ stay at home to take care of her.
| A． can | B．may | C．have to | D．maybe |