For speech class.
Several suggestions: William Shakespeare, St. Crispin's Day speech from Henry V (We few, we happy few, we band of brothers) T.S. Elliot, Old Possum's Book of Practical Cats (basis for the musical) Samuel Taylor Coleridge, Kubla Kahn. Anything by Shel Silverstien (Cloony the Clown might be long enough.) It's a shame Betjamin's "Slough" isn't longer...