关于第一题，答案应该选all of whose homes，因为“the residents，”这个部分之后没有and，or，but之类的连词所以不可能是并列句所以不能选择all of their homes，因而只能为从句，联系句子意思可以确定为一个定语从句，所以选all of whose homes引导一个非限制性定语从句。
关于第二题答案明显选B. What；whom。第二个空后面无需加任何标点符号。
What is known to us all is that the old scientist，for whom life washard in the past， still works very hard in his eighties.(众所周知的是，这个老科学家，与他而言生活曾经艰难过，而如今在他八十多岁之际仍非常努力的工作。) what is known to us all是一个what引导的名词性从句做主语故为主语从句，is that 是系表结构，that引导一个名词性从句做表语从句，而“for whom life washard in the past，”是非限制性定语从句修饰先行词the old scientist的。for whom的意思是“对…而言（来说）” 如常用句型中的“It is +adj+for sb +to do ”的for sb就是“对……而言”用来交代对象。希望对你有帮助，英语取得进步！
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