读一读，填入适当的句子完成对话。

A. Is it big? B. Is it a butterfly? C. Is it on the window? D. What colour is it?

A: Good morning.               

B: Good morning.

A: Look. Is this a fly?             

B: No, it isn't.

A:                           

B: Yes, it is.

A:                           

B: It's blue and green.

A:                          

B: No, it's small.

A: Where is it?              

B: No, it's on the door.

A: Can the butterfly fly.'?         

B: Yes, it can.