What are the keywords in the following sentence? sun rising through a thick fog in the very early morning over a field of round hay bales
fog, morning, rise, sun

What are the keywords in the following sentence? celebrity takes a bow during curtain call following her debut performance .
bow, celebrity, take

What are the keywords in the following sentence? A train traveling past a forest filled with green trees.
forest, train, travel

What are the keywords in the following sentence? building will connect mass transportation system .
building, connect, system