Answer:
The main idea for this paragraph is how children want to grow up and gain the freedom to do anything they want without being restricted by their parents, but when they do, they want to go back to being a kid and have their innocence back.
Desist means in the sentence above is that the student would not cease in making paper air planes
C. himself
There are eight reflexive pronouns in total: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves. If you memorize those, you'll be set.
I think he saying that its beautiful
Repetition contributes to meaning because it is usually used to draw attention to a specific item, word, or phrase. If it's repeating, the idea is more likely to get stuck in your head. This repetitiveness is usually means that that it applies to the overall theme, meaning, etc. in an insightful way.