Inside is related to Throat. Throat is related to Swallow. Swallow is a synonym of Drink. Drink is related to Pop. 
Sweet is a synonym of Pleasant. Pleasant is similar to Grateful. you would Thank because Grateful. Thank is the opposite of Welcome. 
Inside <--RelatedTo--> Throat <--RelatedTo--> Swallow <--Synonym--> Drink <--RelatedTo--> Pop 
Sweet <--Synonym--> Pleasant <--SimilarTo--> Grateful <--MotivatedByGoal-- Thank <--Antonym--> Welcome 