Answer: le
explanation: you say le when you are talking about person A to person B and you are doing something for that person A
Conocemos
Sabe
Conocen
Saben
Sabe
Conozco
Sabe
Sabe
Conocer
Saben
Okay the first one is ALTOS, the second one is SERIAS, and the last one (I'm pretty sure) is SIMPATICA.