Since или for. Урок английского языка

1. I haven't worked sincefor a mounth.

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

3. They haven't visited us sincefor Christmas.

4. Jane hasn't been back to Hungary sincefor last year.

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

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