Answer:
What is black and white and red all over?
Use me to reward good behavior.
I am a box who holds keys but not locks. With the right combination I may unlock your soul
Though I am only two words I have thousands of letters in me
The warmer I am the fresher I am.
I am a food with 5 letters. If you remove the first letter I am a form of energy. Remove two and I'm needed to live. Scramble the last 3 and you can drink me down.