Answer:
Take it and you will lose or gain more than the others.
Who is the most foreign visitor you could imagine?
I have a head and a tail but my eyes can never see my tail.
I store fire-breathing animals.
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
Give it food and it will live, give it water and it will die.