句型转换，每空一词。

1. I’m happy. (一般疑问句并作肯定回答)

    _______  _______ happy?

    _______, _______  _______.

2. There are 12 posters in the classroom. (对划线部分提问)  

    _______  _______ posters are there in the classroom?

3. There is a football field in my school. (改成一般疑问句并作否定回答)

    _______  _______ a football field in _______ school?

    _______, _______ _______.

4. She is American (同义句).

    She is_______  _______.