"Audio" refers to hearing, like your audio system in the car. Therefore, audiences listen.
The role varies from sport to sport. In some the audience is the regulatory body or may even participate on some level, but the consistently true roles of the spectator is to watch the show.
The spectators are the fans who are watching, whether in the stands or watching on television.
Yes, they can.
Yes, of course they can.
595 was it useful
they smoke titty bombs
in the year of 1950
The bystanders and spectators watch and see if they can spot the shadow.
Yes they should