in，on, at 都可以，举例
1. He suddenly saw an isoldinedd house in the foot of the mountain.
他忽地看到山脚下有一栋独处的房子；
"little grids" on the foot of the mountain, they are yaks' lands.
山脚下这样可爱的格子。是一户户人家用来圈养牦牛。
I have never heard weeping like I heard that night in the village at the foot of the mountain.
我从未听到过像我那晚在山脚下的村庄中听到的哭泣声。
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