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按要求改写句子。
1. The story made me feel sad．(改为被动语态)
I _________ _________ _________ _________ sad by the story.
2. The boy usually went to school late.(改为同义句)
The boy _________ _________ _________ to school late.
3. The river has been polluted by the factory since five years ago.(改为主动语态)
The factory _________ _________ the river since five years ago.
4. We're trying to save the manatees. (对画线部分提问)
_________ _________ you trying to _________ ?
5. Manatees eat about 100 pounds of food a day．(改为一般疑问句)
_________ manatees _________ about 100 pounds of food a day?
