用方框中的词将下面一段对话补充完整。

eraser   these   your    isn’t     this

Tom: Excuse me, Grace. Is ______ your pencil?
Grace: Yes, thank you. And those are my _____.
Tom: And Jane, is this ______ book?
Jane: No, it ____. It’s hers.
Tom: OK, and _____ are my pictures. This is your camera, Jane.