Choose the word which best expresses the meaning of the given word.
$VIGOUR$

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The $pioneers$ left a blazing trail of courage,manliness and chivalry.

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Public figures should not indulge in $mud-slinging.$

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In spite of their efforts,the team of scientists could not make much $headway$ to solve the problem.

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The recent acts of $vandalism$ in the country cannot be ignored.

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It is very difficult to $retain$ all that you hear in the class.