Answer:
What can burn the eyes, sting the mouth, yet be consumed?
What is as big as you are and yet does not weight anything?
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
How can you burn an apple, blueberry, rose and pumpkin without leaving any ashes but retaining the smell of it?
When is it bad luck to see a black cat?