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It's known to all that learning a foreign language well    (require) action, or you won't master it...

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know  known  knew  to know  
It is known to all that    As is known to all that    As we know    As it is known to all  
symbol    sign    mark    example  
knowing    having known    known    to know  
As, what    As, as    what ,as    What ,what  
example    sign    mark   symbol  
better­known  well­known   best­known  most­known  
is better??known to  is well??known to   is best??known to   is most??known to  
had they known; went all they    they had known; went all they    had they known; they all went    they had known; they all went  
It is known that      As is well known      Which is well known      We all know that  
distributed  contributed  cancelled  declined  
better-known   well-known   best-known   most-known  
better­known    well­known  best­known   most­known  
The French, their   The French, its   French, their   French, its  
As is known to all    It is known to all   It is known to us all that    As we all know that  
had they known; they all went    they had known; went all they    had they known; went all they    they had known; they all went  

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