i don't know the_________(mean) of this word,so i look it up in the dictionaryi don't know the _____(mean) of this word,so i look it up in the dictionary

--Excuse me.What's this in English?--Sorry,I don't know.look it up in the____. I don't know. “i don't know you know i don't know many of them don't know the____(inportant)of doing exercise. sorry,I don't know. i don`t know much I don't really know. 英语；I don't know I don't know miss I don't know him. I don't know now 翻译 i don't know So know,I don't I don't know her i don't know anything I know enough to know that I don't know i don't know what i I don't think I know you