按要求改写句子。

1. The children had a good time in the park yesterday. (改为同义句) 

    The children _____ _____ in the park yesterday.

2. Lucy reads English every day. (对画线部分提问) 

    _____ _____ _____ Lucy read English?

3. There's a woman in the picture. (改为复数形式)

    There _____ some _____ in the picture.

4. I have a sore throat. (同上)

    What's the _____ _____ you?

影响轴承性能的主要因素有轴承结构、轴承质量、______________、密封和工作环境。