I'm guessing "No!" and "are you sure I won?" are each sentences. So I'd say "No!" has correct capitalization.
Answer: Mattie cries but is happy to see her. Mattie says, "I feel like a turncoat, a traitor." A turncoat is a historical reference to someone who switches political sides, like Benedict Arnold in the American Revolution. Mattie started crying because she feels safe.
Explanation:
2. underline the word his and circle the word hamster
3. underline my and circle parents
4. underline my and circle keys
5. underline our and circle soccer team
6. underline your and circle sister