Zakreśl właściwe słowo:

1. I've been at this school FOR/SINCE five years.
2. I've known my best friend FOR/SIENCE 2008.
3. I've had a cold FOR/SIENCE three days.
4. She has worked here FOR/SIENCE two years.
5. I haven't seen you FOR/SIENCE last summer.
6. He's been away FOR/SIENCE three weeks.