Just find two nonfiction texts, after you read them, write down a list of benefits for each text. then just sum it all up in a few sentences and you're done.
Answer:
It creates uncertainty because the audience cannot be sure if the ghost is actually present, or if Macbeth has simply gone mad.
I would say that remedy/recompense is the correct answer. Recompense means to compensate or make amends.
He is used to the kgb knocking on his door to ask him challenging accusing questions
