Since или for. Урок английского языка

1. We've lived here sincefor seventeen years.

2. I haven't worked sincefor a mounth.

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

4. Jane has worked here sincefor two weeks already.

5. He's been working in the field sincefor early this morning.

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

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.