i know it is i( ) difficult to run a marathon ,but i still want to have to try

I know it is over I know it is worth at The subject of What is interenting is that I do not even know him.is___Awhat Binteresting Cwhat is interesting DI Yes I know it If I know what love is,it is because of If I know what love is,it is because of I know what love is,it is because of you I know ,I get it,I understand . Ehglish high-hand,come help help me 有几道想不通的英语题目,答案我知道,1.-What di you know about the plan -I know every detail about it.＿ I think I know.A.There for B.Or rather C.Namely D.That isThe key is B ,why 2.Li Yu,the king of I knowing it is not easy?还是I know it is not easy? I want to know ____ it is the right answer. This is a miracle I know it's crazy I _ don't know what it is I know it is very good格式对吗 I Don'T Know What It Is 歌词 I don't want know why is it I know where it is.(改为否定句） there is a pattern to these events,I know it . what time is it?sorry,i don 不加know