句型转换，每空一词。

1. This is my ruler.(改为一般疑问句)

    _____ this _____  ruler?

2. That is an eraser.(对画线部分提问)

    _____ is _____ ?

3. I'm OK. (对画线部分提问)

    _____ _____ you?

4. Is this his English book?(作肯定回答)

    Yes, _____ _____ .

5. It is a pencil. (改为否定句)

    It _____ a pencil.