Answer:
5. How would you address Señor Galdós?
answer : usted
6. How would you address Señor Diáz and Señor Millán?
answer: ustedes
Explanation:
Well, Hope it helps you...
Y-your welcome in advance..
(;ŏ﹏ŏ)(ㆁωㆁ)
5 Usted
6 Ustedes