Since или for. Урок английского языка

1. I haven't met Jill sincefor the end of the school.

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

3. We've lived here sincefor seventeen years.

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

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

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

7. He's been working in the field sincefor early this morning.

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

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

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