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They were playing basketball when it started to rain.
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He was reading when the telephone rang.
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They were relaxing in the living room when the baby woke up.
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They were watching TV when the thief came in.
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She was playing golf when it started to rain.
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He was doing his homework when the computer broke.
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They were eating when she arrived.
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They were waiting at the bus stop when they saw a UFO.