1. Mr Hyde was in fact Dr Jekyll.
2. Because Utterson wouldn`t wanted to upset Dr.Jekyll.
3. Pool meant with "got rid of" that his master was murdered.
4. I think there was a youth potion in the bottle next to Mr Hyde`s body, an experiment that had gone wrong.
5. Mr Hyde`s clothes were far too big for him because he was shorter than Dr Jekyll. Every time when Dr Jekyll turned to Mr Hyde,he had shrunk.
6. Utterson thought that Dr.Jekyll was either killed or ran away.
7. As time went by,things got out of control for Dr.Jekyll.
8. Dr.Jekyll said this was his true hour of death,because Mr Hyde`s identity was no longer going to leave him,and He can`t take control of his own brain anymore.