Don't know how long can you hold?

Don't know how long can you hold? You don't know how long I've waited for you you don't know how long I have wating for you.. That's because i love you ,So don't know how long our love will last. I Know how to say stinl long you but I think you don't I really don't know now how long I can still strong How long is it from the hospital to the station?I don't know.改错 看看我这个句子的语法对吗i don't know how long the pen is you don't know how much/how long I want to see you,为什么用how much Don't wait···Because you don't know how long it will take.的意思是什么? i don t think it will be you know how to improve youri don t think it will be____you know how to improve your Enjlish studyA long after B long before C long since D far form that -Xiao Wang ,_will it take to fly to Guangzhou?-Sorry I don't know.A.how far B.how soon C.how many D.how long you don't know how to write You don't know how to write. I don't know how to i don't know how to don’t know how much you perfect no one knows how long it will last.they don't know how long it will___A.keep B.hold C.carry D.continue ,请问选择哪一个,为什么