He was arrested for the use of stimulants.

It is important to understand the merits and demerits of this technology.

This rocket is using a new type of combustion agent.

He kept talking with an impertinent attitude.

I can't stand his impertinence.

There is always a wall existing between him and me.

A deep friendship exists between him and me.

On sleepless nights, I sometimes take a soporific.

I forgot to take the laxative.

When I catch a cold, I often take a sudorific.