Miss Cao: OK, everyone.It's time to clean up.

Students: Yes,Miss Cao.

Helen: Peter,is this your book?

Peter: No,it's his.

Helen: Whose?

Peter: Kevin's. He's over there.

Ann: Is this Miss Cao's mobile phone?

Helen: Yes, it's hers.

Ann: I'll give it to her.

Helen: Are these schoolbags theirs?

Peter: Whose?

Helen: Kim and Jenny's?

Peter: Ummm,no.They're Bill and Albert's.

Helen: Bill and Albert, your schoolbags are over there.

Bill: OK.

Helen: Bill,are these basketballs yours,too?

Kim&Jenny: No, they're ours.

Helen: OK.Kim and Jenny,I'll put your basketballs on the table.

Ann: Aha!This jacket's mine.

Peter: Good!You found it, Ann.

Kevin: Peter, is this sandwich yours?

Peter: Yes, it is.Don't eat it!

Kevin: But it's delicious.

Peter: Uhh!