Answer:
What do you want us to do? Write your report, this is for help on questions, not to do your entire assignment.
Answer:
who's needs to be replaced by which to make the sentence correct.
As with many children who experience trauma or loss of a close parent at an early age, Oskar has lost some of his childhood innocence, and expects the world of adults to be one of pain. Therefore, he closes himself off against it.