每当我去看望祖父母，他们总会为我准备饼干。

___Whenever I visit my grandparents, they always have cookies for me.

我一有空闲时间就尽量去锻炼。

I try to exercise ___whenever I have free time.

你任何时候需要项目上的帮助都可以给我打电话。

You can call me ___whenever you need help with the project.