Franny wanted to go to Spain; however, she could not afford the exorbitant plane ticket.
The word that best fills in the blank is "however". In this sentence,<u> "however" </u>is a connector since<u> it is joining two simple sentences</u>: "Franny wanted to go to Spain" and "She could not afford the exorbitand plane ticket". Moreover, <u>this connector is used to emphasize the contrast between the ideas presented in the two clauses</u>. When "however" is added between two sentences<u>, it is preceded by a semicolon and it is followed by a comma</u>.