He is in the middle of studying for the exam.

In this museum, the entrance fee varies according to three age categories: adults, middle-aged, and children.

Kainaka is my best friend.

He gets excited about creampie in adult videos.

He played the lead role in the middle of the play.

My father is good at Shogi.

Cultural exchange between China and Korea is very important.

Mr. Nakai is my best friend.

She is studying traditional Chinese medicine and is utilizing that knowledge.

Mail arrived while I was away from home.