Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

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

3. We've lived here sincefor seventeen years.

4. I haven't worked sincefor a mounth.

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

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

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

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

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

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