请教几道语法题

pandoroUID: 2121926

1. Eleanor Roosevelt set the standard against which the wives of all United
   States Presidents since have evaluated.

   2. Greenpeace , an international organization of environmental  activists
   founded by Canadians, uses nonviolent means to protest and block activities
   it considers environmentally harm.
   
   3. Not much is it known about the detail of the development and
   acquisition of private communication, especially in the wild.

  答案:1. have been valued
       2.harmful
       3.is it 错了

弱弱地问一下,第一题和第三题为什么要这么改啊 ?第三题我觉得否定词在句首,倒装应该没错啊,还有第二题我知道harm错了,但是不知道句子中的it指代什么?感觉句子里边好像有两个主语,两个谓语.
   就要考试了,语法还一塌糊涂,好郁闷

wingerweskerUID: 2154168

1.被动语态
2.指代organization
3.主语为 not much

cold2100UID: 2142260

第二题我也不明白

clovervUID: 2126260

environmentally是adv.
而environmentally在句中又不是修饰前面动词considers的
所以environmentally就是修饰后面那个词的啦
通常adv.后面都是加adj.的啦
harm n.
harmful adj.