Since или for. Урок английского языка

1. They haven't visited us sincefor Christmas.

2. She has been in hospital sincefor Monday.

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

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

5. Jane has worked here sincefor two weeks already.

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

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

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

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

10. Joe and Josephine have been going out together sincefor Valentine's Day.