I think the topic sentence is sentence 10.
Answer:
Harry Potter and the Philsophers Stone is a good book/movie.
Explanation:
Neville Long-Bottom stands up to his friends because he doesn't want them to get in trouble for sneaking out. This character is different because he is willing to do whatever it takes to keep his friends safe, even if it means standing up to them. (you can add your personal touch for the last question)
The answer is [ because of the separation, sentences with this error often sound awkward, ridiculous, or confusing.]
