Problem: What are the most important words?
Reaching his car again, the narrator grabs his keys and notices that the door is already unlocked.
Answer: door, grab, key, reach

Problem: What are the most important words?
This is two skiers with someone who looks like an instructor.
Answer: instructor, look, skier

Problem: What are the most important words?
family on the picnic in park
Answer:
family, park, picnic