用方框中所给单词的适当形式填空，使短文通顺、正确。每词仅用一次（每空一词）。

you   green   this   welcome   about

A: Hi, Anna. Areyour pencils?

B: No, they're Bob's.

A: And is this hispen?

B: No, it isn't. The blue pen is his.

A: Whatthis dictionary?

B: It's Helen's. And the green pen is hers, too.

A: And the eraser? Is that?

B: Yes, it is.

A: Thank you for your help, Anna.

B: You're.