What are the keywords in the following sentence? The windows of a train showing a reflection.
reflection, train, window

What are the keywords in the following sentence? Cheeseburger with lettuce and tomato, but doughnuts instead of a roll.
cheeseburger, lettuce, tomato

What are the keywords in the following sentence? Two elephants facing each other tusk to tusk.
elephant, face, tusk

What are the keywords in the following sentence? terrace of a cafe in old town
cafe, terrace, town