lose touch|lost touch

大学毕业后我们就失去了联系。

We ___lost ___touch after college.

当我移居国外时，我和大多数中学同学都失去了联系。

When I moved abroad, I ___lost ___touch with most of my school friends.

我得给我表姐打个电话；我不想和她失去联系。

I need to call my cousin; I don't want to ___lose ___touch with her.