Since или for. Урок английского языка

1. Jane hasn't been to America sincefor 1981.

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

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

4. She has been in hospital sincefor Monday.

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

6. Jane has worked here sincefor two weeks already.

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

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.