What Am I Riddles

Question: I may be of the eye,
in order I am pie,
in my center there is a star,
I keep medics where they are.

What am I?

Question: What asks but never answers?

Question: You went into the forest and got me,
you sat down to find me,
you went home with me because you couldn't find me.

What am I?

Question: Swallowing one is fine.
Swallowing two together is fine.
But Swallow them separately and all shall fall.

What are they?

Question: Change a long pause into a short one by doubling a letter.What are the words?