You should summarize the most important parts of the book like theme, symbols, and anything else that is a main contribution to the plot. Also, write about your interpretation of the book and what it's message meant in your mind.
"Their" is correct, because it shows possession of the desk by someone else.
Ethos - credibility/ethics
Pathos- emotions
Logos- logic/facts/reasoning
The preposition in this case is From while the prepositional phrase is From China as it consists of the preposition from and the noun China.
