What are the keywords in the following sentence? widening the road will improve safety .
improve, road, safety

What are the keywords in the following sentence? automobile make with additional parts car which is a model
automobile, car, model

What are the keywords in the following sentence? astronaut floats in gravity of space off the coast during the mission .
astronaut, float, gravity, space

What are the keywords in the following sentence? the new building generates part of its power via a series of external windmills .
building, part, series