ГДЗ граматика Англійська мова 7 клас Мітчелл

Complete with the Past Simple or the Past Progressive of the verbs in brackets. 

1. Luke was riding his bike when he suddenly fell down. 2. Kelly was printing her boarding pass when her brother came home. 3. Richard was driving when he crashed into a tree. 4. As soon as I started eating a sandwich, there was a power cut. 5. What were they doing at the shopping centre when you saw them? 6. Bruce was coming back from the canteen when he tripped on a chair. 7. Linda and Beth were making a salad while their brother was feeding the cat.