Answer:
So cold damp and dark I am. To stay you would refrain yet those who occupy me do never complain.
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
I go up when the rain comes down. What am I?
I am the key that is the hardest to turn
I am expelled from you orally with a sound
When is it bad luck to see a black cat?