Answer:
What has many keys but can't open a single lock?
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
I have a small hill with seven holes.
I climb higher as I get hotter. I can never escape from my crystal cage.
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
Break me and I am better immediately set and harder to be broken again.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic