3.
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 .