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. I've read two books sincefor the weekend.

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

6. Jane has worked here sincefor two weeks already.

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

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

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

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