He was waiting for the guests in the guest room.

He was reading a book in the reading room.

It is his habit to read books in the reading room of the library every day.

There is a smoking room in the hotel.

Where is the bathroom?

I drink coffee in the lounge.

Why don't you try a new hairstyle at the beauty parlour?

The combustion chamber of this engine is designed very efficiently.

I'm going to the nurse's office because I have a headache.

He is operating the equipment in the control room.