.根据句意，用所给动词的正确形式填空。

1.  English           (speak) as native language in many countries.

2.  Do you have the key? The door           (lock) now.

3.  The workers were made           (work) at least 12 hours.

4.  The window            (clean) ten minutes ago, and the room is bright now.

5. The village is building a school.  I hope it            (finish) before December this year.

6.  Please be quiet.  We are not allowed           (make) noise in the reading room.

7.  --Susan, why are you still here? They are all ready to start.    --I'm sorry, but I           (not tell) when to meet.

8.  Western people           (use) knives and forks to have meals.

9.  The light must            (turn) off before           you leave.  

10. Rice            (cut) by the farmers now.

牙合力又称

A．咀嚼压力

B．最大潜力

C．咀嚼力

D．牙周潜力

E．咀嚼肌力