Problem: What are the most important words?
people sunbathing on the beach with a large container ship going past in the sea
Answer: beach, sea, ship

Problem: What are the most important words?
a graduate acknowledges his family and friends as he enters the stadium .
Answer: acknowledge, enter, family, friend, graduate

Problem: What are the most important words?
politician puts down a wreath at the monument for the fallen soldiers of world
Answer:
politician, soldier, wreath