Answer:
Ch side by side, you are inside.
What has many keys but cannot open a single lock or door?
You can tumble in it, Roll in it, Burn it, Animals eat it, Used to cover floors, Still used beyond stall doors. Freshens whatever it is placed on, Absorbs whatever is poured into it. What is it?
What goes up and down the stairs without moving?
This is a plant named after a light source. What is it?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.