His drive for success keeps him moving forward.

Our team was fully mobilized to make the project a success.

His identification was undoubtedly accurate.

The police used fingerprints to identify the criminal.

In mathematics, equivalence classes are a very important concept.

The initial response when an earthquake occurs is very important.

We belong to the same class.

This statue is made of copper.

He found an old copper coin.

He made an effort to overcome his fear.