按要求完成句子，每空一词。

1. That is my grandfather. (改为一般疑问句)

    ______ that _____ grandfather?

2. This is an orange. (改为复数句)

    ______ ______ oranges.

3. His backpack is on the desk. (对划线部分提问)

    ______ ______ his backpack?

4. John has three baseballs. (改为否定句)

    John ______ ______ three baseballs.

5. Does Linda play ping-pong every morning? (作否定回答)

    ______, she ______.