12.1

2) she was reading the newspaper

3)she was cleaning her flat

4)she was having lunch

5)she was washing some clothes

6)she was watching television

                       12.2

1) was wtiting a letter in her room

2) was getting ready to go out

3)were having dinner

4)was making a phone call

                        12.3

1)rang when  I was having a shower

2)began to rain when I was walking home

3)we saw an accident when we were waiting for the bus

                         12.4

1) fell, was painting

2)was reading, heard

3)were you watching

4)was waiting, arrived

5)was not driving, happened

6)broke, was doing

7)took, I was not looking

8)went you, is raining

9)were you doing

10)saw, was wearing