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Ответ:Ex.1

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

Ex.2.

1. How long had she been doing her homework?

2. Since when had you been listening to music?

3. How long had you been watching DVDs?

4.How long had Amie been revising?

5. Since when had he been driving?

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 thick bushes?

9.Since when had she been dreaming of becoming and actress?

10. How long had historians and scientists been conducting investigation?

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