Drive is related to Reverse. Reverse is the opposite of Normal. Normal is a synonym of Conventional. 
Request is related to Bill. Bill is related to Expensive. Expensive is a synonym of Costly. 
Drive <--RelatedTo--> Reverse <--Antonym--> Normal <--Synonym--> Conventional 
Request <--RelatedTo--> Bill <--RelatedTo--> Expensive <--Synonym--> Costly 