Anybody, Somebody, Nobody

___________ is at the door.

Is ___________ at the door?

There isn`t _________ at the door.

There is _________ at the door.

_________ broke the mirror in the bathroom.

Do you know __________in London?

Did _________ see you?

There is ___________at home.

I know _______here.

What are you doing here? - I am waiting for _______.