Since или for. Урок английского языка

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

2. I haven't slept sincefor 48 hours.

3. We've lived here sincefor seventeen years.

4. I haven't worked sincefor a mounth.

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

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

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

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

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

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