Mr. Kazunaka is my best friend.

Nakaei is my best friend.

My computer is currently under examination.

I go jogging every morning before noon.

He is in the middle of studying for the exam.

Cultural exchange between China and Korea is very important.

Mr. Nakai is my best friend.

He is facing many difficulties due to gender identity disorder.

The Ordovician, an era name used in paleontology, is now called the Ordovician.

The Silurian period is one of the geological eras.