Good Riddles

Question: Vanitha goes to park on oct 2 sunitha on oct 3 ramya on oct4 sheela on oct 5 on which date all four friends meet at the park.

Question: The sky is blue, the sea is green. The answer never ends in-between.

Question: Within me you can find gold Also 'The Greatest', if I should be so bold. Unfortunately, as you might see 'The Worst' is also apart of me. What am I?

Question: im fast and slow I go everywhere you go yet you cannot see me im in tree's in the sky in plants and in your body pretty much you need me to survive what am I?

Question: What Two Things Always Ask A Question But never Answer It?