I mailed a letter at the post office.

This tune is my favorite.

My father works at a post office branch.

He played a beautiful serenade for me.

Where is the cathode of this battery?

The Far East is a geographical term referring to a part of Asia.

During the polar night period, it's a very strange experience that the sun doesn't rise.

I think his actions are clearly an unfair act done for his own profit.

I played a game of checkers with him.

He played a serenade for her.