Since или for. Урок английского языка

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

2. We've been friends with Fred sincefor decades.

3. I haven't worked sincefor a mounth.

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

5. They haven't visited us sincefor Christmas.

6. They have been ill sincefor Monday.

7. These cherry trees have bloomed every spring sincefor 1980.

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

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

10. He worked at that company sincefor ten years before he retired.