Changes in the social system inevitably occur with time.

Do you understand the necessity of this project?

This system is necessary to maintain social fairness.

He reads the newspaper every day to keep up with the latest information.

His sociability is an important factor for his success as a leader.

He is known for making impartial judgments.

He should behave impartially towards everyone.

Your cooperation is needed for this project.

I need you.

Education about sex is very important.