我总是出于习惯买同样的牙膏。

I always buy the same toothpaste out of ___habit.

我试着不要养成整天看电视的习惯。

I'm trying not to get into the ___habit of watching TV all the time.

他无法改掉在咖啡里放糖的习惯。

He can't break the ___habit of putting sugar in his coffee.