What are the keywords in the following sentence? airplane fly into a storm cloud
airplane, cloud, fly

What are the keywords in the following sentence? forced rhubarb stems for sale on a market stall at the rhubarb and food festival
festival, force, rhubarb, sale, stall

What are the keywords in the following sentence? classroom of young students in a school
classroom, school, student

What are the keywords in the following sentence? ... the face of this clock features a blue electric guitar with curved white stripes .
clock, face, feature