fill in: since, for, already, just or yet

1. John has JUST finished his homework. His books are still on the table.

2. I haven't seen Sarah ... 2007

3. They haven't bought the tickets for the concert ... .

4. We've lived here ... ten years.

5. He's ... come back from jogging and he's a bit tired

6. We've ... seen that film. Can we watch something else?
Помогите пожалуйста!!!!