He is tackling his job with all his might and sincerity.

I am participating in the committee for the new project.

Mr. Ichii is my best friend.

Asuna is my best friend.

You shouldn't laugh at his failure, because misfortunes can happen to anyone.

I prefer tea over coffee.

He was demoted.

He was demoted because of his poor performance.

This polynomial is represented in descending powers.

His salary was reduced because the company's financial situation worsened.