听录音,选答句。
( ) 1. A. Yes, this is.
( ) 2. A. It's my sister's.
( ) 3. A. Yes, it is.
( ) 4. A. It's seven a clock.
( ) 5. A. It's OK. B. No, she isn't.
B. This is our library.
B. It's on the second floor.
B. It's nice.
B. Great!
C. Yes, it is.
C. It's yellow.
C. It's our playground.
C. It's seveno'clock.
C. Thank you.