阅读短文，判断下面各题是否正确。

Sam: Good afternoon, Bobby. Where's my pencil box?

Bobby: Is that yours? Behind the door?

Sam: I don't know. Let's go and have a look.

Bobby: All right.

Sam: This isn't my pencil box. It's a green lunch box.

Bobby: Oh. It's my lunch box. Look! What's that on the chair?

Sam: Ha! Ha! It's my pencil box.