按要求改写下列句子。

1. My father is a worker. (就划线部分提问)

    ______ ______ your father do?

2. His uncle works in a hospital. (就划线部分提问)

    ______ ______ his uncle work?

3. She is my mother. (改为一般疑问句)

    ______ she ______ mother?

4. My sister takes care of Rose at home. ( 改为同义句)

    My sister ______ ______  Rose at home.

5. His grandma has a job. (改为否定句)

    His grandma ______ ______ a job.

6. I am twelve years old. (就划线部分提问)

    ______ ______ are you?

7. There isn't anybody in the classroom. (改为同义句)

    There ______ ______ in the classroom.

三道信号的昼间显示方式为（）。

A、两臂左右平伸

B、单臂臂向上直伸

C、双臂向上直伸