Lions prey on zebras in the African savannah.

She would often go on a rave about her favorite band.

The country is on the brink of a shooting war.

California and Nevada border on each other.

The weather can have an effect on your mood.

He always yaks on about random things.

Many people frown on smoking in public places.

The accounting manager refused to sign off on the expense report.

I have taken it on myself to organize the meeting.

He got down on one knee and popped the question .