单项选择，从A、B、C中选出最佳的答案。
1） I usually ______ books in the morning.
A. look B. read C. watch
2）— Do you have a baseball?
— ______.
A. No, I do B. Yes, I don't C. Yes, I do
3） ______ do you spell it?
A. What B. How C. Which
4）— Do you mind if I smoke here?
— ______. No smoking here.
A. Oh no, please
B. Yes, please
C. I'm sorry, but I do