He hit the iron with a mallet.

Mr. Kinari is my best friend.

We donated the contributed money to the local library.

We donated a cooperation fee to support local activities.

He was searching for treasure on the beach using a metal detector.

He used a metal detector to search for treasure on the beach.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

The Paleolithic is the first era of human history.

The Mesolithic is the era between the Paleolithic and the Neolithic.

The Bronze Age was an important period in human history.