问题描述：
主动变被动 1.Where did you find the wallet?
2.People should save pandas .3.Mary's parents invited some friends to their home one evening.4.In the United States ,people usually grow rice in the south and wheat in the north.5.The Chinese government has passed some laws to stop the pollution.6.The boys will return the balls to the teacher.
2.People should save pandas .3.Mary's parents invited some friends to their home one evening.4.In the United States ,people usually grow rice in the south and wheat in the north.5.The Chinese government has passed some laws to stop the pollution.6.The boys will return the balls to the teacher.
问题解答：
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