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

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 .

1 This area has changed a lot over the years .
2 used to be
3 take measures to protect
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