Ответ:

1. Does the swimming pool open at 8 o'clock every morning?

2. Is the world population increasing very fast?

3. Does my father usually leave home at 7.30 in the morning?

4. Was it raining when i got up?

5. Has Tom lost his key?

6. Had Emily just got home when i phoned?

7. Can Maria come tomorrow?

8. Must you keep it a secret?

9. Was this book very interesting?

10. Is he in New York?