句型转换。

1. She was seen to come out of the library by him (改为主动语态)

    He ________ _________ ________ out of the library.

2. When are trees often planted? (改为主动语态)

    When ________ people often ________ ________?

3. The League was founded in Guangzhou in 1922. (对画线部分提问)

    ________ ________ ________ ________ the League ________?

4. Did the students wear the school clothes a lot? (改为被动语态)

    ________ the school clothes ________ a lot?

5. Kate looked after the baby well yesterday evening. (改为被动语态)

    The baby _________ _________ ________ well by Kate yesterday evening.

材料净用量的确定方法有（）。

A．理论计算法

B．测定法

C．图纸计算法

D．经验法

E．趋势法