It's not healthy to dwell on the past.

I try not to dwell on past mistakes.

I set out on a journey to explore new places.

We're running late, so step on it!

I turn the lights on and off when I leave the room.

The workers are on strike to demand better working conditions.

I prefer to explore the city on foot.

We are starting to run low on supplies.

The soldiers began to run low on ammunition.

He was arrested on suspicion of assault.