五、单项选择(每小题1分, 共15分)
21. —How much ________ Cindy's trousers？—________ 12 dollars.
A. are；They're B. is；It's
C. do；That's D. does；This is
22. —Where is your English teacher？—She is in ________.
A. Two Room B. the Two Room
C. Rooms Two D. Room Two
23. —Can I help you？—________
A. You can. B. Yes, please. I want a pen.
C. You're welcome. D. I can.
