Answer:
What goes through a door but never goes in and never comes out?
Sometimes imaginary and sometimes real, sometimes they are the closest and dearest person outside the family. Who are they?
If you agree give me one of these.
What is yours but only used by others?
I run cold and hot, I look blue but am red. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.