Here is what I got as the answer:
Servir —> sirvió
Mariana y Esteban van al zoológico, ¿no?
<span>Good Morning!
I (1)
María Pilar León Carrasco, but everyone calls me Pilar. I am a student at the University of Barcelona. It's a big university - (2)
more than 60,000 students! All my friends (3)
to university too. We (4)
live
in an apartment near (close to) the university. We are all medical students, and it is very important to speak English well. My friend Anita and I (5)
pronunciation every day! On Saturdays my companions (6)
in a disco, but I (7)
that work. On Sundays, after Mass (Mass), my friend Anita (8)
a lot of food and all of us (9)
.
And you? What are you like? What do you do? What (10)
?
Write soon!
Pillar</span>
The answer would be "hace". This is because "hace" refers to the usted form. The usted form is used in situations where you are using he, she or it.