When talking TO one teacher (formal scenario), which of the following would be correct?

When speaking directly to a group of kids in Spain, what is correct to use?

When discussing a group of girls (talking about them but not to them), the following pronoun would be correct:

When addressing a group of kids in Latin America you would use:

If you changed the noun in the sentence to a pronoun, the sentence would be: ”El alumno toca a la puerta.”

What could correctly replace the noun in the following sentence? ”Alejandro le dice al maestro: ‘No, maestro.“

What could replace the following sentence: “María tiene 12 años”.

What could replace the phrase “tú y yo”?

Choose the correct definite article (el,la,los,las) ________señor

Choose the correct definite article (el,la,los,las) _______lengua

Choose the correct definite article (el,la,los,las) ____señoritas

Choose the correct definite article (el,la,los,las) _____casa

Choose the correct definite article (el,la,los,las) _____plumas

Choose the correct definite article (el,la,los,las) _____dÍas

Choose the correct indefinite article (un,una,unos,unas) _____alumnos

Choose the correct indefinite article (un,una,unos,unas) _____pluma

Choose the correct indefinite article (un,una,unos,unas) _____clases

Choose the correct indefinite article (un,una,unos,unas) _____dÍa

Choose the correct indefinite article (un,una,unos,unas) _____hombre

Choose the correct indefinite article (un,una,unos,unas) _____señor