Since или for. Урок английского языка

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

2. We've lived here sincefor seventeen years.

3. I haven't worked sincefor a mounth.

4. We haven't seen Mary sincefor the party.

5. She has been in hospital sincefor Monday.

6. You have been watching TV sincefor hours.

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

8. Jane has worked here sincefor two weeks already.

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

10. They have been raising horses and cows on their farm sincefor many years.