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. We've lived here sincefor seventeen years.

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

5. He hasn't played the piano sincefor he was a boy.

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

7. Jane has worked here sincefor two weeks already.

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

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

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