我总是出于习惯购买同一个品牌。

I always buy the same brand out of ___habit.

我正努力不养成深夜吃零食的习惯。

I'm trying not to get into the ___habit of snacking late at night.

他习惯每天早上工作前跑步。

He's in the ___habit of going for a run every morning before work.