We took many pictures ( ) on\in\at Sundays.

we took many pictures on Sundays.
How is Lisa?
再问： 为什么不能用does？
再答： does是动词，如果后文的回答中有动词，那就是does，问题是后文说she IS tired，已经证明了问的人是说How is Lisa，语言这种东西，要有逻辑。人家用is问，你就用is答，反之。