Answer:
use a formal address: Mr or Ms + the person's last name if you know it. If you can't find the last name, use a generic title such as Sir or Madam. The respondent may address you by your first name and sign off with their first name.
Explanation:
hope this was helpful. for number one.
18. c
19.c
20.a
i hope this helps u a little
The conjugation is van for ellos/ellas
Other IR conjugations:
yo voy : I go
tú vas: You (informal) go
él/ella/ello/uno va : He/she/one goes
usted va: You (formal) go
nosotros vamos :We go
vosotros váis : You all (informal) go
ellos/ellas van : They go
Sirve y atiende a los clientes del restaurant.