此时我的父母已经分居了。

By this time my parents were living ___apart.

我会永远记得我们在长时间分开后一起度过的那两天。

I'll always remember those two days which we spent together after such a long time living ___apart.

他们决定分开一段时间好好想想。

They decided to stay ___apart for a while to think things over.