1.Dad was busy working, so he ........(not hear) me open the front door
2.I......(chat) with my friends when he arrived at the cafe.
3.The weather ............(be) nie last Sunday -really warm.
4.Our dog ..........(sit ) in his basket when he suddenly Heard a noise.
5.The students ............(not work) when the teacher Walker back into the classroom. do she was cross.​