The former is my friend, and the latter is my colleague.

He is the main organizer of this event.

He is a world-renowned researcher.

This area is off-limits due to high radiation levels.

We have achieved an important milestone in this project.

Who is the author of this book?

All eligible voters have the right to participate in elections.

The police are looking for an eyewitness to the incident.

He achieved success as a silk manufacturer.

My father works for a paper manufacturer.