Poison gas is leaking from that factory.

I used a gas burner in a chemistry experiment.

This bottle is reusable.

Who is the user of this software?

He is the most competent employee of our company.

Are you really not going to use this unused laptop?

Looking at that person's behavior, I feel like they have some secret.

The police used tear gas against the demonstrators.

Fergus is my best friend.

This factory has significantly reduced its carbon dioxide emissions.