Since или for. Урок английского языка

1. We have received no news sincefor 5:30 pm.

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

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

4. We've been together only sincefor a few days.

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

6. They have been ill sincefor Monday.

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

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

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

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