Answer: Yo soy optimista
I am optimistic
Explanation: The subject in this sentence is "Yo", that is a first-person in the singular, so the verb must be conjugated in this form. Yo soy.

The correct phrase that correctly completes the sentence is "es de", which means that he is from Mexico.
Explanation:
Rato because your spending time with your friends
Answer: buena
Explanation:
When you speak spanish putting the word buena in the end sounds better.
French, Irish, Italian, etc.