Deliver is the opposite of Keep. Keep is a synonym of Retain. Retain is a synonym of Continue. Continued is a form of Continue. 
Air is related to Fresh. Fresh is a synonym of Familiar. Familiar is the opposite of Unknown. 
Deliver <--Antonym--> Keep <--Synonym--> Retain <--Synonym--> Continue <--FormOf-- Continued 
Air <--RelatedTo--> Fresh <--Synonym--> Familiar <--Antonym--> Unknown 