What are the keywords in the following sentence? A crowd of people protest by a governmental building.
building, crowd, protest

What are the keywords in the following sentence? mother and daughter smelling flowers on a terrace .
daughter, flower, smell

What are the keywords in the following sentence? an astronaut drifting in space is rescued by a space shuttle orbiting earth
astronaut, drift, earth, rescue, space

What are the keywords in the following sentence? aircraft taking off on a tropical airport
aircraft, airport, take