Since или for. Урок английского языка

1. We have received no news sincefor 5:30 pm.

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

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

4. We've lived here sincefor seventeen years.

5. We've been together only sincefor a few days.

6. I've read two books sincefor the weekend.

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

8. He worked at that company sincefor ten years before he retired.

9. They've been in love sincefor three weeks.

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