You could try Yahoo!Answers, but you wouldn't receive answers in very quick time there. At least on AB, answers are usually posted very soon after asking the question.
Nope.
Not a single one that has the depth of erudition; familiarity with question types and question-setters; ability to interrogate Google in so many creative ways, nor to build so much tension on simple discussions...
But you can probably find other sites that will claim to answer your questions...