Since или for. Урок английского языка

1. I haven't worked sincefor a mounth.

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

3. We haven't seen Mary sincefor the party.

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. These cherry trees have bloomed every spring sincefor 1980.

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

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

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