我把班级分成了三个小组。

I ___separated the class into three groups.

这个国家的北部和南部被一条山脉分隔开。

The north and south of the country are ___separated by a mountain range.

你可以买一个专门用来分离蛋清和蛋黄的设备。

You can get a special device for ___separating egg whites from yolks.