I do not know why ____________.A.he come late B.he came here是不是都对?

Why I do not know I do not know why this happened! I do not know why I am very sad Why l do not know.This is my feel.Understand?I do not know your mean. Do not know why I become so active!是什么意思 i do not know why my mother seems (be)happy I do not know why,I can not forget you,I still like you! I do not know I do not know what i do not know is that why...是不是应该改为is it that why啊 Do not know why,I secretly Fall in love with you,and you did not find. 我不知道接下来该做什么.I do not know __ __ __or__ __ __ __ __.后面是五个空啊！ Very simple,we do not know,why do I speak to you so much ah. I do not know why I fell in love with you什么意思 怎么读I do not know why,I will tell you,you are my night sky. 请问 I DO NOT KNOW sorry,i do not know! -I do not know this word（单词）.please give me your __.