What are the keywords in the following sentence? Someone keeps his eyes locked on the tiger's movement.
eye, keep, lock

What are the keywords in the following sentence? couple in love passionately hugging .
couple, hug, love

What are the keywords in the following sentence? A train is pulling cars across a bridge.
bridge, car, pull, train

What are the keywords in the following sentence? A bedroom with a light up space scene on the walls.
bedroom, scene, wall