What is a function of the security department? A. Making secured reservations
B. Greeting guests at the front door
C. Monitoring hotel rooms via web cams
D. Planning escape routes in case of an emergency

Which answer best completes this dialogue? sr. gómez. —hola paco. ? qué hora es? —son las nueve de la ma? ana.

The teacher didn't explain this at all and i don't understand this

Juan: ? hola, valeria! feliz cumplea? os. valeria: muchas gracias, juan. juan: valeria: tengo 16 a? os. a. ? qué a? os tenemos? b. ? cuántos a? os tengo? c. ? cuántos a? os tienes? d. ? cuántos a? os tienen?