Since или for. Урок английского языка

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

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

3. They haven't visited us sincefor Christmas.

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

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

6. Dinosaurs have been extinct sincefor over 60 million years.

7. Jane has worked here sincefor two weeks already.

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

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.