What are the keywords in the following sentence? A cat sleeping in a piece of gray luggage.
cat, luggage, piece, sleep

What are the keywords in the following sentence? yachts and other boats moored
boat, moor, yacht

What are the keywords in the following sentence? flow diagram of the system working in winter
diagram, system, work

What are the keywords in the following sentence? angle view of cattle grazing in a field
cattle, field, graze, view