What are the keywords in the following sentence? A person removes a retaining screw from an expansion card on a PC
card, remove, retain, screw

What are the keywords in the following sentence? time lapse of fast moving clouds over a foreground of trees
cloud, foreground, lapse, move, tree

What are the keywords in the following sentence? A large living room with some covered furniture
cover, furniture, room

What are the keywords in the following sentence? row of trees with evening sky in the mountains in summer
row, sky, summer, tree