Answer:
I open wide and tight I shut, Sharp am I and paper-cut fingers too, so do take care, I'm good and bad, so best beware.
What is it that you must give before you can keep it.
We are five little objects of an everyday sort, You will find us all in a tennis court.
When the horse strokes the cat, the wood begins to sing.
White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!
hide me from your parents if you have done bad academically this year.