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To keep healthy,Professor Johnson cycling as a regular form of exercise after he retireD.

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不填;the    不填;a    the;不填    the; a  
/; the    the; /    /; a    the; a  
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To go away right now.     To keep the news from John.    To tell John the news right now.  
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to be informed  to inform  informed  informing  
/; the    /; a    the; /    the; a  
不填;;the   不填;a   the;不填   the; a  
for keeping safe    for the safety    to be safe keeping    to keep it safe  
to be informed  to inform  informed  informing  
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open    opened   to be opened   opening  

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