Answer:
I am heavy forward, but backward I'm not. What am I?
I go inside boots and outside shoes. What am I?
What is the beginning of eternity the end of time and space the beginning of every end and the end of every race?
I can be entertaining until you realize some pieces have been lost.
I begin and have no end. Eventually, I will be the ending of all that has begun. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?