选择合适的答语，将序号填在括号中。
( )1. Where is the canteen?
( )2. Do you have a library?
( )3. Is this your art room?
( )4. How many students are there in your classroom?
( )5. What colour is the fan?
A. It's green.
B. No, we don't.
C. It's on the first floor.
D. Yes, it is.
E. Forty-one.