Final answer:
Two sentences that contribute to the eerie mood in Poe's 'The Fall of the House of Usher' describe the oppressive clouds on a dark day, and the narrator's feelings of iciness, sinking, and sickening of the heart.
Step-by-step explanation:
To determine which two sentences contribute to the overall eerie mood of the adapted excerpt from Edgar Allan Poe's "The Fall of the House of Usher," we must look for descriptions that invoke a feeling of gloom, unease, or despair. The first sentence contributing to the eerie mood can be found in the paragraph that describes the arrival at the house: "DURING the whole of a dull, dark, and soundless day in the autumn of the year, when the clouds hung oppressively low in the heavens", creating an oppressive atmosphere that sets the stage for the story. Another key sentence enhancing the eerie mood is: "There was an iciness, a sinking, a sickening of the heart", which conveys the narrator's deep emotional reaction to the house and the bleak scenery, further amplifying the mood of hopelessness and dread that pervades the narrative.