按要求改写句子。
(1)鲁滨孙在岛上定居下来,过着寂寞的生活。(改成双重否定句)
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(2)鲁滨孙和“星期五”救出了船长。(改成“被”字句)
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(3)鲁滨孙在破船里拾到许多钱,但钱在孤岛上又有什么用呢?(改成陈述句)
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