Задание C: заполнить пропуски глаголами в Past Continuous.

12. Mother was watching TV when he arrived. 13. Tom was playing computer games at 9 pm yesterday. 14. Bob and Mark were reading magazines when their father came. 15. She was sending e-mails until 10 pm last night. 16. His father was recovering in hospital for three weeks after his fall. 17. What were you doing when your mother came home after work? 18. I was not learning a poem while you were writing an exercise.