On which 通常可以等于哪些疑问副词？

关系副词都等于一个适当的介词＋which,在从句中作状语When=in/at/on/…+which;Where=in/at/on/…+which;Why=for/…+which1.Doyoustillrememberthedaywhen(onwhich)wewenttovisitthemuseumtogether?2.Thisisthefactorywhere(inwhich)myfatheronceworked.3.Thisisthereasonwhy(forwhich)hewaslate.