Why don't u have an english version of your site also, I mean the same content only in English. Then you can just point Google to those pages.
Another thing you can do is put some English stuff and make it invisible by using the same color for the font as the back ground. that way the proper ads would come up.
Though sites showed are mostly arabic but text is not much of a different from urdu… I had been using adwords with urdu words campain (using arabic letter from character map of my window xp) & it’s working pretty well…