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There have been my many changes in this area over the years(

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There have been my many changes in this area over the years(改为同义句)
Mr.Green was a doctor in the past .(改为同义句)
Mr.Green _______ ______ ______ doctor .
The government should do something to protect the endangered animals.(同义句转换)
The government should ________ _________ ________ __________ the endangered animals .
There have been my many changes in this area over the years(
1 This area has changed a lot over the years .
2 used to be
3 take measures to protect