3
1 moved
2 was doing
3 was watching
4 arrived, bought, went
5 played
6 was shopping, was booking
7 was shining, were singing
4
1 The Beatles used to be a very famous group.
2 I used to go to my grandparents' house at the weekends.
3 Did she use to work in an office?
4 I didn't use to eat chips when I was a child.
5 She didn't use to go out a lot when she was youger.
6 Did you use to do exercise when you were at school?