B yo Creo que es correcto
1. Tienes la calculadaro means You have the calculator.
This is the shorter way to say (Tu) tienes la calculadaro, where Tu means you. In Spanish, you don't have to use the pronouns Tu, yo, ellos, etc. all the time, because you can understand which pronoun somebody is referring to based on the form of the verb - tienes is used with Tu.
2. One of Gabrilea Mistral's favorite subjects for poems was nature. Gabrilea Mistral was a pseudonym of a poet named Lucia Godoy y Alcayaga, who comes from Chile. She was a famous poet as well as a humanist, so it is only natural that most of her poems would revolve around nature.
3. Many families of students at Miami High School came from Cuba. Many people living in Florida today come from Cuba - they are Cuban immigrants who have come there a long time ago to start a new life and raise their families. This immigration started in the 80s, but it is still ongoing, although a lot less.
