Answer:
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
What is put on a table, cut, but never eaten?
Break it and it is better, immediately set and harder to break again
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
What flies around all day but never goes anywhere?
When is it bad luck to see a black cat?