What are the keywords in the following sentence? A highway filled with lots of traffic on both sides.
fill, highway, lot, side, traffic

What are the keywords in the following sentence? mounted over fireplace all wires hidden
hide, mount, wire

What are the keywords in the following sentence? A very tall tower with a clock mounted on it's side.
clock, mount, side

What are the keywords in the following sentence? painting of a snowman and penguin in the forest with trees .
forest, painting, tree