Problem: What are the most important words?
stairs and walkway connecting the main campus with the building .
Answer: building, connect, walkway

Problem: What are the most important words?
a wild duck with young and carp swimming at pond
Answer: carp, pond, swimming

Problem: What are the most important words?
holiday is a big holiday celebrated that not many people outside uk constituent country know about .
Answer:
celebrate, holiday, know