Ⅴ. 单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中选出可以填入空白处的最佳选项。
21. —What are you going to be when you grow up, Sam?
—____ teacher like you.
A. A B. An C. The D. /
22. —How dangerous!
— Yes. I think the policeman should stop the children soccer in the street.
A. play B. playing C. to play D. plays
23. — _______will your mother come back?
— In two days.