The humidity in this room is high, so let's dehumidify it using a dehumidifier.

The landlady showed us to our room.

The preface of this book is very interesting.

I am planning to have a girls' night out tonight.

She is a cheerful female high school student.

My assistant is very competent.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.