Guess the answer of the following riddle. 1. What goes up and down stairs without moving? 2. Give it food and it will live; give it water and it will die. 3. What can you catch but not throw? 4. I run, yet I have no legs. 5. Take one out and scratch my head, I am now black but one was red. 6. Remove the outside, cook the inside, eat the outside, throws away the inside. 7. What goes around the world and stays in a corner? 8. What gets wetter the more it dries? 9. The more there is, the less you are. 10. They come at night without being called and are lost in the day without being stolen. Write your answer here​