Answer:
What has many keys but can't open a single lock?
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I sleep when you are awake, I am awake when you fall asleep. I can fly but no feathers to aid my flight. What am I?
I mean goodbye for South Americans.
I love to twist and dance. Though wingless I fly high up into the sky.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic