suggestion for ceans!!!

hey ce'ans !!!😛
i think threads like analogies in gre wud be far more effective😁 if those posting the questions can answer it by giving reason as to why tat particularly is the answer and not other options.
and also it wud be more helpful if they can tell the following:
1.given a question in a gre,how to attack it?
2.what are the alternatives if someone donot know the answer{tats during the test}ie.whether in such a situation use thier techie knowledge or commonsense?