He is viewing that situation as a serious problem.

He views that situation as a problem.

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.

Their opinions resemble each other like '已己巳己'.

Kimiko is my best friend.

We will do our best to solve this problem.

We will do our best to solve this problem.

Hiroki is my best friend.