Indefinite pronouns (gap filling)

I am sure I put down my keys ____________

Calm down. There is _______ to worry about.

Let's sit down __________ and talk.

I heard a knock at the door but there was __________ there.

We didn't see ____________:

The restaurant was really crowded. __________ had a good time.

Be quiet! ____________ is coming!

I don't think __________ knows the answer to that question.

She can't go _________ without people recognizing her.

I've got _________ to tell you.