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Yeah, schools teach us: "Preposition is not a good word to end your sentence with" :P

Textbooks for ad copywriters, however, often recommend to use informal style. "Write as though you are talking...

also, 2 words are missing in "program which you interested" (should be (the) progran in which you are interested").

An illiterate native English-speaker could have written "your" instead of "you...