You would use tú when talking to your bestfriend and usted when talking to your doctor
Answer:
Kairo <u>leyó</u> un buen libro en la biblioteca en la escuela
Explanation:
A ellos LES duele(all that are in singular)
la boca el dedo la nariz el tobillo la cabeza
The revolution began against a background of widespread dissatisfaction with the elitist and oligarchical policies of Porfirio Díaz that favoured wealthy landowners and industrialists.