Since или for. Урок английского языка

1. You haven't smoked sincefor two months.

2. We've lived here sincefor seventeen years.

3. I haven't worked sincefor a mounth.

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

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

6. I haven't talked to him sincefor last week.

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

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

9. New ideas have been put into practice sincefor he was elected our leader.

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