Problem: What are the most important words?
foliage of a grove of oak trees seen against the light
Answer: foliage, grove, tree

Problem: What are the most important words?
bicyclists walk across the bridge located at the western part .
Answer: bridge, part, walk

Problem: What are the most important words?
a mother and daughter standing leaning against the wooden wall of a barn on a farm .
Answer:
barn, farm, wall