Since или for. Урок английского языка

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

2. Jane hasn't been to America sincefor 1981.

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

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

5. They haven't visited us sincefor Christmas.

6. She has been in hospital sincefor Monday.

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

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

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.