Put the verb in brackets into the Past Simple tense or the Past Continuous tense. Children ___ (do) their homework when their parents came home.

Перевод задания: Поставьте глагол в скобках в форму Past Simple или Past Continuous.

Children were doing their homework when their parents came home. (Дети делали домашнее задание, когда их родители пришли домой.)

Действие было длительным и происходило в момент другого действия, поэтому используется Past Continuous: were doing.

Ответ: were doing