Problem: What are the most important words?
a man rides his motorbike through the city centre .
Answer: centre, motorbike, ride

Problem: What are the most important words?
students work on homework during a free afterschool program .
Answer: homework, student, work

Problem: What are the most important words?
vast bedroom in a chalet ... like the white floor and dark ceiling .
Answer:
bedroom, ceiling, chalet