1. Sandy washes clothes. (用at that time改写)
    ________________________________________________.
2. They have got married. (用for two years改写句子)
    ________________________________________________.
3. I've known him since he came to our city. (对划线部分提问)
     _______________________________________________.
4. I was doing some cooking at 11 yesterday morning. (对划线部分提问)
     _______________________________________________.
5. The printer was repaired by Sam just now. (对划线部分提问)
      ______________________________________________.
6. The food in this restaurant is delicious. (改成感叹句)
      ______________________________________________.
7. We clean our classroom twice a day. (改为被动语态)
       ______________________________________________.
8. 深圳已经变成了一个现代化城市.
    Shenzhen has ____________________________________.
9. 她过去常常在星期天去购物.
    She ____________________________________on Sunday.