5. Bill's friends aren't very noisy today. Bill's friends weren't

Для выполнения задания необходимо изменить предложение, используя слова yesterday, the day before yesterday, last night, last month, two days ago, last Monday.

В данном случае используем слово two days ago.

5. Bill's friends aren't very noisy today. Bill's friends weren't very noisy two days ago.

Ответ: Bill's friends weren't very noisy two days ago.