Контрольные задания > What is more, all mobile phone 6) _______ should limit the number of times their phone rings. Most of all, don't shout on your mobile in public places, your mobile is not a megaphone!
Вопрос:
What is more, all mobile phone 6) _______ should limit the number of times their phone rings. Most of all, don't shout on your mobile in public places, your mobile is not a megaphone!
6) The sentence structure suggests a noun is needed, referring to the devices themselves or perhaps their owners/users. Given the context of etiquette, 'users' or 'owners' would fit, but 'phones' is also plausible if referring to the devices' settings.