What are the keywords in the following sentence? trees growing in a small lake at protected site
grow, site, tree

What are the keywords in the following sentence? Men looking into a barrel to check their barbecue.
barbecue, barrel, check

What are the keywords in the following sentence? The sheep are eating hay in from a trough.
eat, hay, trough

What are the keywords in the following sentence? lonely tree at a paddy field with blue sky
field, sky, tree