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clears cleared will clear has been clearing
it is impossible to live without war war is the only way to settle international disagreements war must be abolished if man wants to survive war will be abolished by modern ingenuity
clears cleared will clear has been clearing
the use of man-made materials has had harmful effects on the modern civilization pollution has become a more and more serious problem that is threatening the survival of humanity our technological achievements have grown very rapidly in the last twenty years we should not make increasing industrialization our chief aim
the use of man-made materials has had harmful effects on the modern civilization pollution has become a more and more serious problem which is threatening the survival of human beings our technological achievements have grown rapidly in the last twenty years we should not make increasing industrialization our chief aim
accidental aggressive contradictory controversial
been essentially wrong from the very beginning had disappointing results thus far produced a finer, braver kind of modern man fulfilled the hope of the American rebels of 1776
build have built are built are being built
will help abolish war put mankind in grave danger wii1 gradually become part of man’s life need further improving
had smelt has smelt is smelling smelt
been essentially wrong from the very beginning had disappointing results thus far produced a finer, braver kind of modern man fulfilled the hope of the American rebels of 1776
checked out went out cleared up thought up
looked up kept up taken up cleared up
checked up went through cleared up reminded of
to reduce modern technology to improve man’s way of life to warn people not to change the natural environment to call attention to the protection of the natural environment
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