9. While she were reading the newspapers, her brother listened to music. Choices: read / was reading; were listening / was listening.

Перевод задания: Простое прошедшее или прошедшее длительное время.

While she was reading the newspapers, her brother was listening to music.
Пока она читала газеты, её брат слушал музыку.

Оба действия происходили одновременно, поэтому используем Past Continuous. С подлежащиями she и her brother употребляется was.