Since или for. Урок английского языка

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

2. You haven't smoked sincefor two months.

3. We've been friends with Fred sincefor decades.

4. I haven't slept sincefor 48 hours.

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

6. She has been in hospital sincefor Monday.

7. Jane has worked here sincefor two weeks already.

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

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

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