What are the keywords in the following sentence? six people cross country skiing in a forest
cross, forest, skiing

What are the keywords in the following sentence? asphalt road through the green field and clouds on blue sky in summer day
asphalt, cloud, road, sky

What are the keywords in the following sentence? exploring a city a property overlooking tourist attraction with an abundance
attraction, city, property

What are the keywords in the following sentence? texture of moss and lichen growing on the bark of a tree
bark, grow, texture, tree