I need the rest of the questions/the answers choices to answer lol but i’d love to help if you can add that
<h2>Cambia el verbo en negrita y escríbelo en el presente perfecto. Change the verb in bold and write it in the present perfect.</h2><h3><em>Mariana, ¿nunca viste (2 palabras) las ruinas de Machu Picchu?</em></h3>
Answer : Mariana, ¿nunca has visto las ruinas de Machu Picchu?
Translation : Mariana, have you ever seen the Machu Picchu ruins?
Hope this helps!

Me alegro de que ellos hayan hecho tanto bien como les enseña
A difference between schools in Nicaragua and Costa Rica is that in Nicaragua it is mandatory to go to school from age 6 to 12, while in Costa Rica you have to go to school from ages 3 to 15. From age 16-18 going to school is not mandatory in Costa Rica.