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It's polite to knock at the door before e    the room.

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do knock    is knocking    knock    knocking
  
Knocked    To knock   Knocking    Knock  
Knock    Knocking    Knocked    To knock  
with knocking    by knocking    without knocking    and knock  
Is; knock off   Are; knock off   Are; knock away   Is; knock away  
knock down    knock out    knock into    knock off  
Is; knock off   Are; knock away   Are; knock off   Is; knock away  
knock  knocking  knocked  to knock  
to knock    knocking    knocked    knock  
knock into    knock at    knock on    knock off  
is; knocking    is; knock    are; knocking    are; knock    
knock  knocking  knocks  to knock  
misalignment or worn main bearings  insufficient cylinder lubrication  defective or poorly fitted valves  All of the above  
impolite    polite    politely    interesting  
knocked  to knock  knock  knocking  

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