If you are using the book for and want to improve your speaking and fluency , the version with audio/MP3 is highly recommended. However, if you already have a strong grasp of spoken English and only need to brush up on written rules, the standard book without audio may suffice. Sources: Cambridge University Press - English Grammar in Use Raymond Murphy's Grammar Series Overview User Reviews: English Grammar in Use with Answers and eBook
I understand you're looking for an to English Grammar in Use (Intermediate) by Raymond Murphy, specifically in relation to a "long paper" (perhaps meaning a full printed book or answer key). english grammar in use intermediate mp3