英语语法题,请说出该空在句子中的语法和理由.

英语语法题,请说出该空在句子中的语法和理由.
pointing to the house on ____root grew lots of bush,the old man told me that was____ i would stay.whose：where.
zhaopin.com did a survey of____students spent on job hunt and found the expense varied from person to person.答案是how much.