Since или for. Урок английского языка

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

2. We've been friends with Fred sincefor decades.

3. My boss has been away sincefor half a day only.

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

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

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

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

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

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

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