推荐回答（1个）
1、Nowhere in nature is aluminum found free,owing to its always being combined with other elements,most commonly with oxygen.
it's 改为 its
owing to its always being combined with other elements,most commonly with oxygen.翻译为：是由于它总是与其他元素相结合，最常见的就是与氧结合。 its 表示它的（特性和特质，属性），it's 表示它是，不符合句意。
2. According to some educators,the goal of teaching is to help students learn what they need to know to live a well-adjusted and successful life.
that 改为 what 定语从句， what they need to know ，表示他们需要了解的事情， that 不可以引导 need to know ...
欢迎追问， 谢谢采纳~~
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