1. They stayed up / in / on late because they were watching TV.
2. My boyfriend is taking me away / out / in today to a fancy restaurant.
3. They called on / off / back the meeting because they were tired.
4. The dog's sitting on / at / in the top of the stairs.
5. The bathroom is in / at / on the end of the corridor.
6. He ran towards / in front of / in the middle of he [tutaj brakuje części zdania, ale zakładam, że będzie in, bo towards łaczy się z rzeczą - biegł do, a run in - wbiec w coś]