David Foster Wallace grammar challenge

From a nonfiction workshop taught by David Foster Wallace at Pomona College, a 10-question grammar worksheet that is titled:

IF NO ONE HAS YET TAUGHT YOU HOW TO AVOID OR REPAIR CLAUSES LIKE THE FOLLOWING, YOU SHOULD, IN MY OPINION, THINK SERIOUSLY ABOUT SUING SOMEBODY, PERHAPS AS CO-PLAINTIFF WITH WHOEVER’S PAID YOUR TUITION

I nailed #4 exactly, and give myself half points (for knowing the problem, but not the proper solution) on #1,2,5,& 8. For even coming close, I feel pretty good about it.