'Tough' becomes subjective to individual perception and then this thread would be no more than a shadow of the already-running GMAT SC thread. In case someone intends to start a separate thread for Boldfaced SCs or CRs, it is okies!
So, I would suggest, you post your query at
http://www.pagalguy.com/forum/gmat-a...scussions.html (GMAT Sentence Correction Discussions)
Thread Locked.