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.

Umie is my best friend.

We went to the seashore with our family on the weekend.

We had a picnic near the sea.

This sea route is an ancient trade route.

The seahorse is a small marine creature, named for its resemblance to a horse's head.

This jacket is made of down feathers and is very warm.

I go to the sea with my family during summer vacation.