Useful is the opposite of Waste. Waste is related to Left. Left is related to Punch. you would Punch because Angry. 
Crucial is a synonym of Excellent. Excellent is related to Cell. Cell is related to Bedroom. 
Useful <--Antonym--> Waste <--RelatedTo--> Left <--RelatedTo--> Punch --MotivatedByGoal--> Angry 
Crucial <--Synonym--> Excellent <--RelatedTo--> Cell <--RelatedTo--> Bedroom 