What are the keywords in the following sentence? A train traveling down tracks along side of a river.
side, track, train, travel

What are the keywords in the following sentence? aerial shot with a drone of a tropical rain forest and a rural road
forest, road, shoot

What are the keywords in the following sentence? A woman is purchasing baked goods from another woman behind the counter.
bake, counter, good

What are the keywords in the following sentence? A woman yells into a microphone so the crowd can hear her.
crowd, hear, microphone, yell