Fill the gaps with one another or each other. 1) There are a lot of people in the room, they can’t see &&&&&&&&. 2) People must be able to communicate and understand &&&&&&&&. 3) They talk to &&&&&&&& on the phone every night. 4) Mike and Viktor were sitting next to &&&&&&&&. 5) At Christmas people often give &&&&&&&& presents. 6) I believe Jack and Jill don’t like &&&&&&&&. 7) Today we can communicate with &&&&&&&& across oceans. 8) Two people can see &&&&&&&& communicating by means of Skype. 9) In conference calls by means of Skype all people can talk to &&&&&&&&. 10) Sara and Fred told &&&&&&&& about their hobbies.

Вот заполненные предложения с пояснениями. Я соблюдал правило: для двух лиц обычно используется each other, для более чем двух — one another (в некоторых контекстах допускаются оба варианта, но здесь так и сделано). 1) There are a lot of people in the room, they can’t see one another. - Причина: в комнате много людей (более двух) → one another. 2) People must be able to communicate and understand one another. - Причина: речь о группе людей (более двух) → one another. 3) They talk to each other on the phone every night. - Причина: здесь предполагаются две стороны общения → each other. 4) Mike and Viktor were sitting next to each other. - Причина: две персоны → each other. 5) At Christmas people often give one another presents. - Причина: многие люди → one another. 6) I believe Jack and Jill don’t like each other. - Причина: две персоны → each other. 7) Today we can communicate with one another across oceans. - Причина: множество людей в современном мире → one another. 8) Two people can see each other communicating by means of Skype. - Причина: две персоны → each other. 9) In conference calls by means of Skype all people can talk to one another. - Причина: группа людей (более двух) → one another. 10) Sara and Fred told each other about their hobbies. - Причина: две персоны → each other. Краткие выводы: - each other = для двух лиц; - one another = для более чем двух лиц. Если нужно, могу привести дополнительные примеры или варианты ответов.