Someone told them a joke, they _____ since then., has been laughing, has laughed, have laughed, have been laughing, How long _____ you _____ that newspaper?, have / been reading, have / read, have / reading, have / being read, She _____ the piano since she was 12., have played, have been playing, has played, has been playing, My son _____ television for four hours. If he continues watching it, he'll certainly get a headche., has been watching, have been watching, has been watched, has been watch, She _____ since 4 o'clock., has been waiting, have been waiting, has waiting, have waiting, The dog _____ barking for twenty minutes., have bark, has been barked, has been barking, has barked.

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