Answer:
I am there when you sit, but gone when you stand. What am I?
I have a head and a tail but no body. What am I?
I am alive without breath and cold as death. I am never thirsty but always drinking.
I am free the first time and the second time, but the third time is going to cost you money. What am I?
If I drink, I die. If I eat, I am fine. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.