用适当的介词或副词填空。

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1. Jack is a strong (强壮的) boy. He can jump ____.

2. Lift ____ your left leg.

3.I often go to school ____ foot.

4. Can you play chess ____ me?

5. We are trying ____ follow the old man's orders.

6. Bend ____.

大型污水厂的污泥的稳定化处理一般采用：（）

A．厌氧生物处理法

B．好氧消化法

C．氯化氧化法

D．石灰稳定法