听问句，选择正确答句，序号填在括号里。(10分）
（1）A. On the wall. B. On the second floor. C. On the floor.
（2）A. He’s Mike. B. It’s Mike. C. Mike’s.
（3）A. Three. B. I’m three. C. Three teacher’s offices.
（4）A. No, it’s not. B. No, we don’t. C. Yes, it is.
（5）A. Yes, it is. B. No, I can’t. C. Yes, you can.