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

When - While

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