What are the keywords in the following sentence? graduates listen to a speech saturday afternoon during the graduation ceremony .
ceremony, graduate, listen, speech

What are the keywords in the following sentence? athlete on the ball against boxer during the opener
athlete, ball, opener

What are the keywords in the following sentence? cup of coffee served on a wooden surface
coffee, cup, serve

What are the keywords in the following sentence? red heart with an arrow of the cupid
arrow, cupid, heart