He is at a good age.

He always speaks honestly about things and is respected by people.

I was chosen as a committee member of the school.

Participation is optional.

He chose to act on his own free will.

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.

Growth hormone plays an important role in promoting the growth of the human body.

Because of his color blindness, he has difficulty distinguishing between red and green.