Literature is read for various reasons. For example, some people read literature to understand other people better. Others read it for escapism. Entertainment is another common reason. All of these reasons depend on the author providing the reader with new information that is different to their own experiences of the world. If the author does not tell the reader more than he already knows, it is unlikely that the reader will be informed or entertained by the work.
Answer: Fabio's attitude changed because he'd be in the parade.
Explanation: Fabio is excited to be able to participate in the parade. The focus of the question isn't on why he'd be in the parade or how? But on what makes his attitude change. Every other factor mentioned corroborates that he'd be participating in the parade.
The irony about the ending of the poem "Richard Cory" by Edwin Arlington Robinson is that Richard Cory, the person being talked about in the poem, who was envied by many because of his wealth and class, committed suicide.
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