Though they may know their parents are right, teenagers sometimes tend to _____ act against their parents’ wishes because they hope to get away from the control of them.
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? ---____.
Hangzhou is one of the most beautiful cities ___ I have ever visited.