Since или for. Урок английского языка

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

2. You haven't smoked sincefor two months.

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

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

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

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

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

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

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

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