Answer:
What gets whiter the dirtier it gets?
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
What kind of dog keeps the best time?
I belong to everyone. Sometimes make you happy, sometimes make you sad. I will never end until the day you do. What am I?
What gets sharper the more you use it?
Why did the stadium get so hot after the game?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic