Problem: What are the most important words?
soldiers in vehicles protecting the boundaries of the airport .
Answer: protect, soldier, vehicle

Problem: What are the most important words?
macaques are often still taken away from their families to be kept as pets with people .
Answer: family, pet, take

Problem: What are the most important words?
footballers lead the celebrations after winning football league sponsored by match .
Answer:
footballer, league, match, sponsor