Answer:
What has many keys but can't open a single lock?
The more of me you take, the more I appear behind you. What am I?
I have wheels and flies yet I am not an aircraft.
If two is company and three is a crowd, what is four and five?
Weight in my belly trees on my back nails in my ribs feet I do lack.
A little house full of meat, no door to go in and eat.