What are the keywords in the following sentence? mural of author on a wall
author, mural, wall

What are the keywords in the following sentence? detail of a building with curved balconies
balcony, building, detail

What are the keywords in the following sentence? A cat looks unamused at a toy mouse.
cat, look, mouse

What are the keywords in the following sentence? people watching the elephants being fed at feeding time
feed, time, watch