My birthday is on the thirty-first.

My father is forty-one years old.

He is known as a one-hit wonder singer.

Nitrogen monoxide is a cause of air pollution.

The First International was an international organization of workers.

His shoes are a symmetrical pair, perfectly matching left and right.

Our project is scheduled to be completed on the eleventh day of the month.

His painting expresses pure beauty.

He was walking around the room wearing only underpants.

I reserved a single room.