What school do you attend? - I attend Saints Monica
En what type of school do you attend public or private school? I study in a public school.
le duele la cabeza tambien
The second answer. Because “sus” is the only one which has the “s” because it is plural. If it would be “nuestro” it should had an “s” like “nuestros hijos son altos” or “tus hijos son altos”