用所给词的适当形式填空。

l. Don't play while _____ (eat).

2. It's_____ (usual) for a 7-year-old boy to work out the difficult problem.

3.Who jumps_____ (high)in your class?

4. Why don't you try_____ (ride) a bike to go to school?

5. Keep_____ (work) hard until you make it.

客户办理基金账户销户时，向柜台提交填妥的《开放式基金销户申请表》。