ПОМОГИТЕ ПЖ С АНГЛИЙСКИМ 7 класс

1) for
2) since
3) for
4) for
5) since
6) for
7) for
8) since
9) since
10) for

Questions:
1) How long had she been doing her homework before she remembered to call her tutor?
2) How long had you been listening to music?
3) Why hadn't you cooked anything for dinner?
4) How long had Amie been revising before she passed her test?
5) Since when had he been diving?
6) How long hadn't they been sleeping?
7) How long had his family been having dinner?
8) Since when had the policeman been hiding in the bushes?
9) Since when had she been dreaming of becoming an actress?
10) How long had historians and scientists been conducting investigations?