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It is essential that mankind ______ ways and means to protect the environment.

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A telephone is essential.  What many people think necessary is not necessary at all.  You would not use a telephone unless you were in a hurry.  A car is essential for a taxi-driver.  
a;the   a;/   /;/   the;the  
attain  essential  will make  available  
human beings are basically good  mankind is evil in nature  mankind can be taught to be good  both A and C  
the; the    /; the    /; /    the; /  
essential to   essentially for   essential   essentially  
retain  endure  maintain  survive  
salaries  awards  wages  rewards  
The; /; the   The; a; /   A.; /; the   A.; a; /  
as a result of    in the name of    in a state of    by the side of  
vital, acting    vital, acts    essential, acting    essential, acts
  
It, equal    It, equally    This, equal    This, equally  
人造卫星漫步    月球漫步    太空漫步    火星漫步  
to benefit  benefiting   to benefiting  benefited  
a;the  a;/  the;the  /;/