Answer:
5. D
6. A
7. C
Explanation:
5. It would not make sense to say that the Sacramento region squandered great power before proceeding to the explain how the region enjoyed immense influence at the time.
Applied is a good choice, although passive. Exerted is by far the best choice since it implies projection of power. Employed great power seems to be too strong for the occasion but also works to give the idea of power accumulation and use.
6. Penetralium in this case refers to the innermost parts of the house or its interior. Generally the term penetralium is associated with either a hidden room or the deepest most hidden parts of a building, but it can also be used to refer to the interior of a house that is particularly imposing, mysterious or unknown to the visitor.
7. A sham is associated with a false imitation of a person or event that carries a strong connotation of shame and mockery. A sham can be a disgraceful and unwarranted copy of something that is considered sacred or important.
In this context, Douglass explains how the recently freed slaves did not have the luxury of celebrating the freedom of their nation because of the social derision received by an important part of Americans.