It seems to me that the two forces struggling when the narrator bites back her tongue are Meimei vs. self. This meaning, the narrator is battling herself, her Meimei self. Her family called her that way because she was the youngest sister. It seems to me that is a battle against her childhood, her attempt to be or, at least, act as a grown up. Her mother is telling she to restrain her childish whim.
Yes, Montresor shows his guilt in the nagging sound that he imagine hearing coming from the floor boards where he hid the body. he also admits to the crime, after going insane from said guilt.
Match or surpass ( a person or achievement)
The correct answer is D being able to analyze media messages as you would for other subjects
It helps a reader better understand the text he/she is reading with notes