句型转换。

1. It is a box. (改为复数形式)

    They _____ _____.

2. It's time to have lunch, Jenny. (改为同义句)

    It's time _____ ______ Jenny.

3. Li Ming does some housework at home. (改为否定句)

    Li Ming do housework at home.

4. My father walks to work.(改为同义句)

    My father goes to work _______ _______.

5. This orange is orange. (改为同义句)

    This is _______ orange _______.

在练习开动铣床前，控制主轴转速和自动进给量的转盘（）应处于（）位置。