A. Yes, it is.
B. Hi, Joe.
C. Yes, they are.
D. Thank you.
A. Hi, Joe.
B. No, it isn't.
C. Thank you.
D. Six yuan, please.
E. Yes, they are.
⑴Is this your pen?
⑵Your room is nice.
⑶Are these your rulers?
⑷Is this your room, Peter?
A．Thank you.
B．No, it isn't .
C．No, they aren't.
D．Yes. Come in, please.