Answer:
Who keeps the ocean clean?
Everyone asks for me but yet everyone hates to face me. For someone I am agony, for others I am relief! What am I?
I have a foot but no leg. What am I?
What goes all around the world but never leaves its corner?
I make you weak at the worst of all times. I keep you safe I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak but seldom the bold.
When is it bad luck to see a black cat?