1,It was far from the town that there was no electricity ,so we had to use oil lamps.有两种修改办法：
1） 用“so + 形容词 + that 从句”改为结果状语从句,意思是“如此...以至于...”：
It was so far from the town that there was no electricity ,so we had to use oil lamps.这里离城如此远以至于没有电,我们只好用油灯.
句子化简即为：
It was so far that there was no electricity
2）改为非限制性定语从句
It was far from the town,where there was no electricity ,so we had to use oil lamps.这里离城十分远,在这里没有电,我们只好用油灯.
2.It must be some better way to test a studnets's true ability besides knowledge.
1） 改错题一般只有一个错误,因此在发布提问时一定要注意不要把本来原题是正确的地方写错,本题中的 a studnets's 就写错了（应该是 a studnet's ）,容易让人把注意力转移到这个词上而忽略了主要错误.
2）must be 表示一种肯定的猜测,即“必定是/必定有”,如果这个题目不具体标明错误的地方,就会存在两种改法：
* It must be (a) better way to test a studnets's true ability besides knowledge.那必定是一种检查学生包括知识在内的真正能力的更好方法.（把 some 改为 a,it must be a 表示那一定是一个）
* (There) must be some better way to test a studnets's true ability besides knowledge.必定有某种检查学生包括知识在内的真正能力的更好方法（把it 改为表示存在的引导词 there,there must be some 表示一定有某种）