Since или for. Урок английского языка

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

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

3. She has been in hospital sincefor Monday.

4. You have been watching TV sincefor hours.

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

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

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

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

9. New ideas have been put into practice sincefor he was elected our leader.

10. They've been teaching here sincefor quite a long time.