1) ______ I was reading a book, my phone rang. a) While b) When 2) She was cooking dinner ______ the power went out. a) While b) When 3) They were playing outside _____ it started to rain. a) While b) When 4) ______ he arrived, we were watching a movie. a) While b) When 5) I saw an old friend ______ I was walking in the park. a) While b) When 6) The children were sleeping soundly ______ their parents came home. a) While b) When 7) _______ she was studying, her brother interrupted her. a) While b) When 8) He was listening to music ______ he was cleaning his room. a) While b) When 9) When the teacher was explaining the lesson, a student asked a question. a) While b) When 10) We were having a picnic ______ a bee stung me. a) While b) When

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