1.应该用that,Have you found an answer to the question -（---that----I asksd you this morning
that引导的括号部分修饰the question,可将其放到you后面还原为“I asksd you the question this morning",an answer to the question是固定用法——“问题的答案”.
2.when 引导的是状语从句,可用on which 替代,原句拆分为：I still remember the day.I first came to the school on "the day".