1.
1.1. -
1.2. was having; was telling
1.3. were singing; were playing
1.4. opened; jumped out
1.5. was riding; realised; hadn't on
1.6. was dreaming about; woke up
2.
1.1. -
1.2. When I went out, I had done my homework.
1.3. When she found a parking space, she had gone to the supermarket.
1.4. When I opened all my birthday presents, my parents had come downstairs.
1.5. The referee had blown the half-time whistle, when our team scored five goals.
1.6. When he put the children to bed, he had sat down and turned on the television.
3.
1.1. -
1.2. as soon as we could
1.3. while she ( Mary ) was watching TV
1.4. was sleeping when
1.5. then went downstairs
1.6. he took the photogragh
4.
1.1. -
1.2. (wrong) She realised that she'd already seen the film.
1.3. (wrong) I loved that old TV show.
1.4. (wrong) Daniel always sticks out with his friends.
1.5. (wrong) ... because they had fallen out
1.6. (right)