<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!

The number that is not like the others is 16. All of the other numbers are divisible by 3. (21/3 = 7, 15/3 = 5, 6/3 = 2, 27/3 = 9)
Explanation:
3. What does the text mean when it says that teachers have to "exercise a kind of art like seduction, hypnosis"?
The teacher has to use methods that are increasingly exotic and rare in order to hold the attention of his students.
Teachers, like hypnotists, have to train for a long time before they can seduce their respective audiences.
Educating today's students requires using pedagogical methods that are very much like seduction.
Unable to exercise any kind of traditional discipline in the classroom, there is no choice but to try to control his students through personality and charisma.