Since или for. Урок английского языка

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

2. We've lived here sincefor seventeen years.

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

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

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

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

7. Jane has worked here sincefor two weeks already.

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

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

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