Контрольные задания

Вопрос:

Фото задания: 13. When I (to come) home yesterday, the children (to run) and (to sing) merrily. "We (to learn) a new song!" they cried.

Фото задания

13. When I (to come) home yesterday, the children (to run) and (to sing) merrily. "We (to learn) a new song!" they cried.

came, were running, were singing, were learning