Past perfect tense 10 предложении

1. The children had done their homework by six oclock yesterday.
2. By the end of the year they had already built a new supermarket.
3. When I came home my granny had already cooked a pie.
4. My friend had passed all his exams by the end of May.
5. My parents had already returned from work by 7 oclock yesterday.
6. He said that he had already visited this exhibition.
7. We were told that the teacher had already checked our tests.
8. My friend said that he had bought two tickets to the cinema.
9. By 5 oclock all guests had already gathered in the hall.
10. My sister had already translated the article by Saturday.