At first, the narrator feels a(n) motivation to become a prodigy to earn her parent's

It's quite difficult to fill the gaps without any options or choises. Accordng to the structure of the sentence, the first fap shoud be filled with adjective that emphasizes the strong motivation. And in the second gap there must be something synonymous with ''approval''. Hope it will help. Next time check it carefully.

Theme- central idea or messagemotif= recurrent idea, symbol, or image that develops and/or develop a theme

The answer to this question is (sonnet55) itself. the speaker means this as whoever is gone is now living through the sonnet forever.