What are the keywords in the following sentence? passengers watch an airplane pull in .
passenger, pull, watch

What are the keywords in the following sentence? players in a huddle during the match
huddle, match, player

What are the keywords in the following sentence? his children joined their mother in laying the yellow flowers upon the stone
flower, lay, mother

What are the keywords in the following sentence? facade of an ancient building against blue sky
building, facade, sky