Wähle 'since' oder 'for' aus.

1. Betty has been writing emails 10 o´clock.
2. The parents have been waiting 20 minutes.
3. The pupils have been listening this morning.
4. We haven't been waiting hours.
5. They have they been living in London 2 years.
6. Tommy has been working problems lunch.
7. Jane hasn´t been phoning 2 days.
8. The parents have been reading they got up.
9. I have been standing here an hour.