4 We were having lunch at a lovely restaurant every day when we were on holiday.

В данном предложении неверно использовано время Past Continuous для выражения повторяющегося действия в прошлом. Для выражения повторяющихся действий в прошлом следует использовать Past Simple или Used to.

Исправленный вариант:

We had lunch at a lovely restaurant every day when we were on holiday.

Ответ: We had lunch at a lovely restaurant every day when we were on holiday.