1. What comes once in a minute, twice in a moment, but never in a thousand years?

2. What gets wetter the more it dries?

3. What can travel around the world while staying in a corner?

4. What has a head and a tail but no body?

5. What is full of holes but still holds water?

6. What has many keys but can't open a single lock?

7. What is always in front of you but can't be seen?

8. What belongs to you but is used more by others?

9. What gets bigger the more you take away?

10. What can you catch but not throw?