The weather is very nice today, isn't it?

The atmosphere of this song is very calming, isn't it?

He is always a cheerful person.

The agency head announced a new project at today's meeting.

There are three post offices in my town.

This tune is my favorite.

I mailed a letter at the post office.

My father works at a post office branch.

Where is the cathode of this battery?

He played a beautiful serenade for me.