(1) Is this hotel ----- you said we were to stay in your let

第一道D
第二道B
the hotel 是先行词；
you said were to stay 是定语部分；
in your letter 是状语；
要填的是定语从句引导词。
现在就看 先行词 和 定语部分：
the hotel 应该是 you said were to stay in 。
注意原题中的 in 是分配在状语里的,因此定语部分就没有介词 in 了。
该有介词而没有介词的定语部分就要用 关系副词 来引导。关系副词就是 where when why 等。而 that which 称为 关系代词。现在用 关系副词,当然选 where 。