under pressure, Scientists are often __________ to publish positive results quickly., in charge, The head researcher is __________ of the entire project., by law, All medical experiments must follow ethical rules __________., by accident, He deleted the data __________. It was a mistake., In doubt, Participants can leave the study if they are __________ about continuing., by chance, He discovered penicilin ______, on average, Students sleep 7 hours a night __________., on purpose, She didn’t say that __________; she was just nervous.

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