Решение:
Выбираем правильную форму глагола в зависимости от контекста предложения.
- 5. They watched/watching/watch an interesting film a week ago. — They watched an interesting film a week ago. (Прошедшее время, 'a week ago' указывает на прошедшее действие).
- 6. My mum doesn't have to/can't wear a uniform at work. — My mum doesn't have to wear a uniform at work. (Нет необходимости носить униформу).
Ответ: 5-watched, 6-doesn't have to.