I would say the 1st one is the only one correct. The 2nd one should be who, the 3rd one should more and likely be whom, and the last one should probably be who. I don't know if I'm 100% though. I hope I helped.
Answer:
I believe that would be 3.
Omg I love that book...
Max keeps growing and growing and growing. Grim thinks it's from carrying "poor Kevin around." But Max tells him he's not that heavy.
That might be it
Spelling and grammar mistakes.