As students, ____, we should study hard to be well prepared for the future.
----Is Jim coming by train?---- I’m not sure. He ________drive his car.
— I can’t give up smoking, doctor.For your health, I’m afraid you _______.
--_________ I come back before five o’clock?--No, you________. But you can’t be back later than seven o’clock.
---Must I tell Mike about it?---No, you _______. He’s already been told.
We brush our teeth twice a day.