Ответ:
1 I was reading a book while I was on holiday.
2 I was hanging out with my friends while I was on holiday.
3 I was writing an essay while I was on holiday.
4 I was shopping with my mum while I was on holiday.
5 I was listening to the music while I was on holiday.
6 I was learning Japanese while I was on holiday.
Объяснение: