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.

Cell biology is the study of the structure and function of cells, which are the basic units of life.

We have a responsibility to protect the biodiversity of the Earth.

I am very interested in marine biology.