1.
1 was
2 was having/ went
3 was eating/ rang
4was taking
5 was having/ gave
6 met
7 was watering/ started
8 was eating/drank
2.
1) Mother was watching TV when he arrived.
2) Tom was playing computer games at 9PM yesterday.
3) Bob and Mark were reading magazines when their father came.
4) She was sending e-mails until 10PM last night.
5) His father was recovering in hospital for three weeks after his fall.
3.
1) They were doing the homework when their father came.
2) His parents were reading while Tom was sleeping.
3) When Ann was watching TV, he was dancing.
4) Mother was cooking dinner when Kate heard a noise.
5) John was reading a magazine when the film started.
2more exciting than
3the busiest
4more dangerous than