Fill in: since or for

1. I have been waiting here 6 o'clock.
2. Helen has been waiting 50 minutes.
3. Tim and Mandy have been learning French six years.
4. Fred and Bob have been learning French 1998.
5. Mandy and Josephine have been going out together Valentine's Day.
6. I haven't been on holiday last August.
7. Ann has been saving her money many years.
8. I haven't eaten anything breakfast.
9. They have been watching TV hours.
10. We have been living here 2 years.