句型转换。

1. They had a wonderful time. (改为否定句)

    ____________________________________________________

2. Li Ming went to Dalian with his parents for his last holiday. (改为一般疑问句)

    ____________________________________________________

3. My father did the cooking himself. (就划线部分提问)

    ____________________________________________________

4. They visited the Great Wall yesterday. (就划线部分提问)

    ____________________________________________________

5. I was born in 1997 in Beijing. (改为一般疑问句)

    ____________________________________________________

机电质量标准化分为（）个等级。