How was his paper done by him? Has he giben you your books?
Change into active passive voice?

eager to consume a lot of food? insatiable appetite?

explanation:

"the tune the he might never know again." this part build anticipation. dexter got extremely happy by the piano tune. he could see what he was living at that moment in his life throught this feeling. the reader might want to learn more about his happy life. in fact, he called it a state of   'ecstasy'. the fact that he had got in a mood of intense appreciation and that everything about him was extremely bright and glamorous might lead the reader to feel that this state of happiness may not last long. the two parts from the excerpt that exemplify the anticipation are: " the sound of the "; " it was a know again."

i have identified the gerund in this sentence by writing it in all capitals.

gerund phrase: writing it in all capitals

gerund use: object of preposition

most people   learn at a very young age like 8 or 9 or even 10 but usually teenage years is when