What are the keywords in the following sentence? An airplane is doing tricks and emitting smoke.
airplane, smoke, trick

What are the keywords in the following sentence? close up of a water lily on a pond
close, pond, water

What are the keywords in the following sentence? A jet in the sky and some skiers on snowy slopes
skier, sky, slope

What are the keywords in the following sentence? site listing category blocks part are seen
list, part, site