Sentiences 3 and 8 because they express emotional thought other than fact. For sentence three, using "terrible waste" can be debateable and shows more of an opinion. And sentence 8, by using "shouldn't" showing its still a posssiby something can or can not happen.
Characterization of Mrs. Gleason because it shows that her character is nice and joyful and very offering
Its C the other answers dont fit the context