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?