看图完成对话，每空一词。
1. A: ________ ________ your backpack?
    B: It"s________ ________ ________.
2. A: ________ ________ his books?
    B: They are ________ ________ ________.
3. A: ________ the keys on the dresser?
    B: No, they are ________ ________ ________.
4. A:________ the baseball on the desk?
    B: No, it"s ________ ________ ________.
5. A:________ ________ the girl?
    B:________ is ________ the tree.