He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

It is important for each person to fulfill their role.

He was receiving an intravenous injection.

This park is quiet and secluded, giving a sense of being away from the hustle and bustle of the city.

Prepositions are an important part of grammar.

I placed the materials before the important meeting.

We must consider appropriate measures for this problem.