keep不规则变化

keep的不规则变化为kept

例句

1、

I go swimming every day in order to keep fit.

我每天游泳以保持健康。

2、

You'll need to keep a clear head for your interview.

你面试时需要保持清醒的头脑。

3、

It is important to keep calm in an emergency.

情况紧急的时候，保持镇静是重要的。