Answer:
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
When they are caught, they are thrown away. When they escape, you itch all day.
What measures out time. Until in time all is smashed to it?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
A word of five letters, Upside down is the same, A shark does this, But it’s not to blame. What is the word?