American Indians about five percent of the US population
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.