kept后面加什么形式

We kept up a correspondence for many years.

我们保持了很多年的通信联系。

Have you kept in contact with any of your friends from college?

你和你大学里的朋友还保持联系吗？

Your application will be kept on file.

你的`申请书将存档。

The thought kept going round and round in her head.

这个想法一直萦绕在她的心头。

He kept us at it all day.

他让我们不停地干了一天。