I used a gas burner in a chemistry experiment.

I will abstain from attending this meeting.

We are participating in this project by delegation.

Please remember to bring your admission ticket.

This bottle is reusable.

He is the most competent employee of our company.

Are you really not going to use this unused laptop?

I went to the police station yesterday.

Police dogs are very effective in tracking criminals.

He was terrified of living in a police state.