—They are my father's shorts.

—It's his key.

—It is Tom's book.

Whose Dogs?

    Tom and his Mum walk in a street. They see a big dog and a small dog there.

    "Tom, do you know whose dogs they are?" his Mum asks.

    "Sorry, I don't know."

    "The big dog is the small dog's Mum." says the mother.

    "Oh, I know. The small dog is the big dog's son." answers Tom.

—They are my shoes.

    This is Mike's bedroom. It's new and nice. Today Mike's friends, Tom and Lucy are here, too. They are playing video games. Many things are on the bed. It's messy（凌乱的）. The coat is Mike's. The T-shirt and the socks are Tom's. There is a red cap. It must be Lucy's.

ModelB: Whose cap is this? It's Lisa's cap.

⑴Are these your shoes?            A. It's a T-shirt.

⑵What are these ?                    B. They are keys.

⑶What is this?                          C. Yes, they are.

⑷Is this your blue shirt?           D. It's Jenny's.

⑸Whose sweater is this?          E. No, it's not.