What are the keywords in the following sentence? flower in the garden little white spider
flower, garden, spider

What are the keywords in the following sentence? selection of wine for sale in the well stocked wine department of a supermarket
sale, selection, supermarket

What are the keywords in the following sentence? we found these tracks on the way and had to have some fun .
find, fun, way

What are the keywords in the following sentence? a painting of clouds in the northern sky with field and trees
field, painting, sky