Kaya is my best friend.

I selected a pizza from the menu.

This project is done by him.

The moonflower is a beautiful flower that blooms at night.

The night is quiet and beautiful.

He is an expert in embryology, studying the developmental processes of many kinds of organisms.

The process of embryogenesis is very complex, with continuous cell division and differentiation.

It's not so much a big problem.

Oh, that's right, I remembered what I ate for dinner yesterday.

He is an expert in seismology.