Answer:
The poet chooses each word carefully so that both its meaning and sound contribute to the tone and the feeling of the poem pay attention to types of words that recur in a poem! :)
"Because he is such a friendly dog, we often take him to the dog park."
That is what I would say
I'd say just Mary Shelly's Frankenstein, as the others seem to be self-contained, demanding no research. Meanwhile, researching Mary's life and her era all give ample background as to the influence and history leading to the novel inventing the genre of science fiction.
