What Am I Riddles

Question: What is one in every doll, in every doll, in every doll?

Question: Draw, fire, or fill me;
I'm still empty.

What am I?

Question: I wear a red coat and have a stone in my throat.

What am I?

Question: What has four legs and can't walk?

Question: Take my first and make it my last, now I happened in the past.

What am I?