What are the keywords in the following sentence? flag flying full staff in the wind
flag, fly, staff, wind

What are the keywords in the following sentence? A black dog is digging through some trash.
dig, dog, trash

What are the keywords in the following sentence? Two giraffes appear to be searching for food from a tree.
appear, giraffe, tree

What are the keywords in the following sentence? the colourful roofs of new market and city hall
hall, market, roof