1. Поставь глагол в скобка в Past Perfect.

Решение:

Past Perfect используется для обозначения действия, которое произошло до другого действия или момента в прошлом.

1. I had had breakfast before I went to school.
2. He went to meet his friends after he had done his homework.
3. He had worked at the factory before he entered the college.
4. Alice got a bad mark for his test because she had made a lot of mistakes in it.
5. She went to the post office after she had written the letter.

Ответ: 1. had had; 2. had done; 3. had worked; 4. had made; 5. had written.