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?