He didn’t come to school yesterday _______ that he was ill.
--Who has opened the door? ---I think it __ be Lin Tao. He’s always the first to get here.
The boy is good ___ learning English and he does well ___ it.
it's cold here. You’d better __ your clothes. A. not put on B. take off C to put on D. not take off
What you said just now sounded ___ a good idea.
---How long will Tom stay here? ---____.