Since или for. Урок английского языка

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

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

3. They haven't visited us sincefor Christmas.

4. You have been watching TV sincefor hours.

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

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

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

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

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.