He is my schoolmate from elementary school.

He is studying ballistics as a part of physics.

He is an expert in ethology.

He is known as an expert in library science.

She works as a librarian.

Do you know whether he is coming or not?

What's up, you look pale.

Adding green peas to the salad makes it colorful.

Endo is my best friend.

What do you think of his ways to rule?