Answer:
Chris McCandless, aka Alexander Supertramp, experiences various enlightening moments that unfold the main idea in the novel, "Into the Wild". Jon Krakauer clearly portrays this main idea of his novel: a young man attempts to find true happiness through solitude and nature, instead of finding it in society.
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Benefit: advantage:: gradual: slowly
The first two wrods are synonyms. To continue the sequence, you have to look for the closest meaning or synonym of the second word: gradual. Thus, the next word should be a synonym of gradual. I chose the word "slowly".