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Ответ:

3

1 I fell asleep while I was watching the film.

2 The teacher called me back as I was leaving the classroom.

3 The head teacher came in while we were doing the exam.

4 As we were driving to the airport, I realised I didn't have my passport.

5 While you were shopping, three people called for you.

6 She met one of her friends while she was taking the dog for a walk.

7 As we were talking, I realised that I'd met her before.

8 They didn't speak while they were doing their homework.

4
Нужно написать причину события, используя past perfect.

1 Why was she crying? miss the plane
 Because she had missed the plane.

2 Why couldn't he find his bike? somebody steal it
 Because somebody had stolen it.

3 Why did they buy a new car? have the old one for 15 years
  Because they had had the old one for 15 years.

4 Why were you scared of flying? never fly before
  Because I had never flown before.

5 Why was everything white in the moming? snow the night before
  Because it had snowed the night before.

6 Why didn't she pass her exam? not study much
  Because she hadn't studied much.

7 Why didn't he board the plane? lose passport
  Because he had lost his passport.

8 Why didn't Alex have any money? spend it
  Because he had spent it.

9 Why did she miss the bus? not leave on time
  Because she hadn't left on time.

Объяснение:

В упр. 3 в главной части используется past simple, а в придаточных после while и as надо использовать past continuous.

В упр. 4 для объяснения причины используется past perfect (had + 3я форма глагола).