4 While he (travel) on the bus to work, he fem.&mber&dremember) that lake tomorrow, weather will be it was his wife's birthday.

4. While he travelled on the bus to work, he remembered that it was his wife's birthday.

Перевод:

4. Пока он ехал в автобусе на работу, он вспомнил, что у его жены день рождения.

Ответ: travelled, remembered