继续保持好工作！

___Keep ___up the good work!

确保你饮食得当——你必须保持体力。

Make sure you eat properly - you've got to ___keep your strength ___up.

我加入是因为我想保持我的英语水平，并且多学一些。

I joined because I wanted to ___keep ___up my English and also, to learn some more.