Answer:
I know a word of letters three. Add two and fewer there will be. What is the word?
I work when I play and play when I work
I may be made of metal, bone, or wood and have many teeth. My bite hurts no one and the ladies love me. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
Give it food and it will live, give it water and it will die.