问题描述：
把句子改为被动语态
1Tourists from all over the world visit Venice.
2 Trained artists make many of the carnival masks.
3 Rich people gave parties every day for a month.
1Tourists from all over the world visit Venice.
2 Trained artists make many of the carnival masks.
3 Rich people gave parties every day for a month.
问题解答：
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