补全对话，每空一词。

John:  me, is this  eraser?

Mark: No,  isn't. It's white.  is black.

John: And is that dictionary ?

Mark:  , it is. And that red schoolbag is mine, .

John: Thank . Jane,  these your books?

Jane: Yes, they are.  names are on them.

John:   these black pens? Are they yours?

Jane: No, they . 

John: Are  Lucy's?

Jane: Yes, they are.

John: Thank you  helping me.

Jane: You're .