1) ______ my father was reading a book , he heard a noise. a) When b) While 2) I was having a shower ______ my brother broke my mother's favourite vase. a) when b) while 3) ______ the teacher came into the classroom ,some students were running around. a) When b) While 4) I came home ______ all the guests were having tea and biscuits. a) when b) while 5) ______ Sue was waiting for the train , she met an old friend. a) When b) While 6) ______ the bus left , Thomas was running to the bus stop. a) When b) While 7) The electricity went off ______ we were watching a horror film. a) when b) while 8) Tom fell off the tree ______ he was picking apples. a) when b) while 9) I was doing homework ______ my mother knocked at the door. a) when b) while 10) ______ it started raining , they were playing football. a) When b) While

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