He treats us as a big friend.

Bioterrorism is a serious threat to modern society.

He spends a lot of time for peacekeeping.

He is a pacifist and absolutely does not support war.

We all wish for world peace.

A new approach is needed to solve this set of problems.

The main problem with this project is the lack of communication.

This question text is too difficult, it's hard to understand.

This exam is a matter of life or death for me.

He is viewing that situation as a serious problem.