1. The children have been decorating the classroom since 9.a.m.
2. I've been listening music since 3 p.m.
3. The police have been searching for the (?) boy since 8 a.m.
4. Mum has been washing up since 9.15 a.m.
5. Betty has been learning that poem since 10 a.m.
6. The actors have been rehearsing the play since 2 p.m.
