Since или for. Урок английского языка

1. Jane hasn't been to America sincefor 1981.

2. We've been friends with Fred sincefor decades.

3. We've lived here sincefor seventeen years.

4. I haven't worked sincefor a mounth.

5. You have been watching TV sincefor hours.

6. He hasn't played the piano sincefor he was a boy.

7. Dinosaurs have been extinct sincefor over 60 million years.

8. These cherry trees have bloomed every spring sincefor 1980.

9. They've been teaching here sincefor quite a long time.

10. Joe and Josephine have been going out together sincefor Valentine's Day.