请教大家几个关于新概念3的问题~

1 They could be saved so much misery and expense if they chose to live in the city wher they rightly belong.这句话中，为什么是could be saved 的肿着被动语态？could be done表明什么？然后belong不是vi么？不及物动词为什么最后不是belong to而单单用一个belong？
2 It can take as long aseight days to rig up rope ladders and to establish supply bases before a descent can be made into a very deep cave.这句话中最后面，为什么不是which can be made into a very deep cave？直接can be为什么可以这样用？
谢谢大家~~~~~~~~~~

先回答第一个问题：
could save sb. sth.变成被动语态：sb. could be saved sth.
where they rightly belong 是定语从句，关系副词where=to which。

did tony really generous？why?

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