Write FOR or SINCE in each gap to complete the sentences.
1. I've been here ___ 20 minutes! Where were you?
2. I've been here ___ two o'clock. Where were you?
3. I've just got here but Dawn's been here ___ half past one.
4. I've just got here but Dawn's been here ___ three hours.
5. They've lived in Madrid ___ the past eight years.
6. They've lived in Linz ___ last January.