1. was phoning / arrived
2.opened/ rang
3. Was/ saw
4.did /saw
5.cut/ was shaving
6.was reading / went
7.were you waiting
8.was he/ noticed
9.were you doing
10.was walking/ started
11.was sitting/ began
12.came/ looked / went
13.was she laughing/ saw
14.had/ laughed
15.were waiting/ arrived
16.was coming
17.was having/ started