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. I haven't slept sincefor 48 hours.

4. We've lived here sincefor seventeen years.

5. They haven't visited us sincefor Christmas.

6. Jane hasn't been back to Hungary sincefor last year.

7. Jane has worked here sincefor two weeks already.

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

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

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