What are the keywords in the following sentence? athletes receive their gold during day
athlete, day, gold

What are the keywords in the following sentence? lioness and her cubs feeding on a zebra that she had just killed
kill, lioness, zebra

What are the keywords in the following sentence? male doctor and a nurse looking at files in a hospital ward with patients
doctor, look, nurse, patient, ward

What are the keywords in the following sentence? A man is kneeling to fix a machine.
fix, kneel, machine