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The plane is used as a training centre (by them).
Over 200 patients in the poor area were operated on (by the volunteer doctors).
Some useful advice was given to us (by the teacher) yesterday./We were given some useful 
advice (by the teacher) yesterday.
Local doctors and nurses are invited on board to learn about eye operations (by us).
Many schools are built in poor areas (by the government) every year.
80 per cent of these diseases can be cured (by us).
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