It is _ pretending to know what you don't know

It is _ pretending to know what you don't know I _ don't know what it is if you know what the trouble is,why don't you help them to _ Don’t claim to know what you don’t know. Don't you know that?Anybody _(know) it love you don't know what to I don't know what is it 和 I don't know what it is i don't know what you know don't know what to You don't know what you mean to me.Know you know I'm crazy o Don't you know it! what you don't know ,you don't know