Good Riddles

Question: I am a nice word composed of five letters, but the Romans would call me a numbers.

What am I?

Question: It takes one word to separate them; otherwise they are inseparable.

What are they?

Question: Whoever makes me can hear me, but nobody else can.

What am I?

Question: A poor woman takes an expensive piece of jewelry, when she is caught the owner of the jewelry tells her "You can have this for seven figures or you will go to jail." The woman soon leaves with the jewelry.

How did she do this?

Question: I am shorter when I stand and taller when I sit.
Sometimes I'm even called a pit.

What am I?