What are the keywords in the following sentence? an aircraft takes off the plane
aircraft, plane, take

What are the keywords in the following sentence? A train with mirrors on the outside sits on some tracks.
mirror, track, train

What are the keywords in the following sentence? small stream and bridge with stone cottages in the village
bridge, cottage, stream

What are the keywords in the following sentence? the statue of politician looking down a city
city, look, statue