Good Riddles

Question: Stars, scores and springs have them. Fingers, and backs have them. Keys, switches and cups have them. Leaders and mothers have them.

Question: One day, Jack went to Walmart. He saw Santa and wanting to talk to him. He then told Santa what he wanted for Christmas. At the end, Santa told Jack, Merry Christmas. Jack said, I can't. Santa was confused. What does Jack mean, I can't?

Question: To be here is to be close to those dear,
I see no light but feel warmth from within,
it's lonely here but soon I'll be free.

What am I?

Question: What is 3/7 chicken, 2/3 cat, and 1/2 goat?

Question: Two men play five sets of tennis together and each win three sets.

How is this possible?