Ответ:
1) I had lost my old phone, before I bought new.
2)Had she come home
3)I was not hungry because I had had lunch with my colleague.
4)She came to the office to meet him, but he had already left
5)My sister had finished all her wedding preparation by the end of the spring.
6)He remembered that he had left his passport at home
7)I was very upset as my son had forgotten about my birthday.
8)I got this job because I had prepared for the interview really well.
Объяснение: