Students from all over the country will participate in this contest.

Keiichi is my best friend.

Yuichi is my best friend.

His face was full of happiness.

The military officer attached to the embassy plays a crucial role in gathering military information of that country.

On days when the solar radiation is strong, don't forget to apply sunscreen.

He is a renowned political scientist who has written many important papers.

He is painting a picture using a brush.

It's difficult to calculate the area of this hexagon.

My luggage is in the coin-operated locker.