1) ______ my father was reading a book , my mother looked at the family album. a) When b) While 2) I was having a shower ______ my friend broke my mother's favourite vase. a) When b) While 3) ______ the teacher came into the classroom, some students were arguing with each other. a) When b) While 4) I arrived home ______ all the guests were having tea and biscuits. a) When b) While 5) ______ Sue was waiting for the 12 o'clock train , she met an old friend. a) When b) While 6) What were you doing ______ the teacher looked at you suddenly? a) When b) While 7) ______ the train left , Thomas was rushing to the station. a) When b) While 8) The electricity went off ______ we were watching a horror film. a) When b) While 9) Mr.Robinson fell off the tree ______ he was looking at the little bird's nest. a) When b) While 10) I was doing homework ______ my mother knocked at the door. a) When b) While 11) I was having lunch ______ James arrived. a) When b) While 12) ______ I heard the doorbell, I went to the door. a) When b) While 13) ______ Jo was washing her hair, I did my homework. a) When b) While 14) ______ I buy the bread, you can go to the butcher's. a) When b) While 15) I was at the baker's ______ I met Jo. a) When b) While 16) The customer was being helped by the salesman ______ the thief came into the store. a) When b) While 17) ______ you saw Keith, was he with Jo? a) When b) While 18) I was in the shop ______ someone stole my bag a) When b) While 19) I hurt my back ______ I tried to lift the piano. a) When b) While 20) ______ we were standing outside the cinema, someone picked my pocket. a) When b) While 21) ______ Mrs Scott came back to her hotel, she called the elevator. a) When b) While

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