What are the keywords in the following sentence? heart carved into a tree bark
bark, carve, heart

What are the keywords in the following sentence? wind and rain along a highway
highway, rain, wind

What are the keywords in the following sentence? A pizza with cheese on in it being cooked in a skillet.
cheese, pizza, skillet

What are the keywords in the following sentence? A cat in a room near a pipes without sheet rock covering them.
cover, pipe, room