What are the keywords in the following sentence? campus and main building of the university
building, campus, university

What are the keywords in the following sentence? an old antique clock hanging on the wall
clock, hang, wall

What are the keywords in the following sentence? Moving past a desk, someone lowers his gaze to a dead man on the floor.
floor, gaze, lower

What are the keywords in the following sentence? how to safely secure a christmas tree on your car
car, secure, tree