Answer:
I am an odd number. Take away one letter and I become even. What number am I?
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
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?
What goes all around the world but never leaves its corner?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk