Since или for. Урок английского языка

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

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

3. We've lived here sincefor seventeen years.

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

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

6. They have been ill sincefor Monday.

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

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

9. John and Bob have been working on this project sincefor five months already.

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