He had to make a difficult choice.

The axiom of choice is one of the important axioms that form the foundation of mathematics.

Natural selection plays an important role in the evolution of organisms.

You have the right to choose your own future.

He has a very passive personality.

His nature is very kind.

Detailed information is needed to understand the nature of that project.

I was moved by his sincerity.

His nature is very kind.

My teaching practice will start from next week.