Based on the given excerpt above, I can say that the what the carp represents here are DEATH and INNOCENCE. Death here refers to how the twenty-pound carp was being treated and innocence refers to the teachers and boarding students who tasted the carp. This excerpt is actually from Yun Wang's "The Carp" and this lyric poem reflects his bad experiences from his father, such as imprisonment and torture.
Never watched it but I am just going to say the FAT CAT lol
A - Samantha returned the book herself.
When using the active voice, the subject comes before the verb with the action (Samantha returned). Passive sentences have a noun with the action being done TO them (cake was made, buildings were built, coach was pushed)