What are the keywords in the following sentence? An airplane sits on a tarmac preparing to load passengers.
airplane, load, sit, tarmac

What are the keywords in the following sentence? charged atoms the number of protons determines the element .
atom, element, number, proton

What are the keywords in the following sentence? A freight train travelling at dusk with lights on.
light, train, travel

What are the keywords in the following sentence? man and women looking out to sea on a stormy day in english civil parish
look, parish, sea