有所给词的适当形式填空。

1. Could you please _____ (sweep) the floor?

2. They have to _____ (get) home to do their homework.

3. You need _____ ( have) a rest.

4. Don't forget _____ (buy) some books for me.

5. Please help me _____ (make) dinner.

6. Thank you for _____ (ask) me to your party.

7. They are going to have fun _____(speak) English.

8. They _____ (have) a party now.

9. How about _____ (go) for a walk after supper?

10. How often do you _____ ( play) football?

11. There is a _____ ( meet) today.

校正勃氏仪圆筒试料层体积时，至少做两次试验，其结果不超过（），取平均值作为料层体积。