What are the keywords in the following sentence? silhouette of a tree against the moon
moon, silhouette, tree

What are the keywords in the following sentence? a cuban coin with a portrait of military commander and an american dollar bill
coin, commander, portrait

What are the keywords in the following sentence? A zebra eats on the other side of its enclosure.
eat, enclosure, side

What are the keywords in the following sentence? A white tray filled with lots of food.
food, lot, tray