What are the keywords in the following sentence? Cars, tents, and people are camping in a large green space near a mountain.
car, mountain, tent

What are the keywords in the following sentence? workers shout slogans while being detained by the police during a protest on thursday .
police, protest, shout, slogan

What are the keywords in the following sentence? The family bought the plane at a local flea-market, and are testing it out in the parking lot.
family, plane, test

What are the keywords in the following sentence? passengers await a tram at a tram stop
passenger, stop, tram