Answer:
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
What is often returned, but never borrowed/
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
When there is fire in me then I am still cold. When I own your true love’s face then you will not see me. To all things I give no more than I am given. In time I may have all things, and yet I can keep nothing.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?