A disturbing report appeared recently in the magazine Science.The report describes an experiment,the results of which suggest that there are occasions when psychiatrists have great difficulty in distinguishing between people who are mentally ill and those who are mentally healthy.(1)_______________________.The eight false patients included several trained doctors,who lied about their occupation.They also lied about their names and naturally about their symptoms.However in all other respects they told the truth concerning their lives and their personal relationships;and once they had been admitted to hospital they behaved quite normally.(2)_______________________.For instance, if one of the “patients” approached a doctor and asked a perfectly sensible question such as “Pardon me doctor, could you tell me when I will be allowed to use the tennis courts?”,the doctor’s normal response was to walk straight on, ignoring the question.The eight false patients stayed in the mental institutes for periods of from 7 to 52 days.They were forced to the frightening conclusion that once a person has disappeared behind the walls of a mental institution,(3)_________________________________________.