Answer:
What can you catch but not throw?
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
Goes over all the hills and hollows. Bites hard, but never swallows.
What can be measured but not seen?
I can move even when you are still. I can be one or many.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.