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Practically $every\, part$ of the banana tree is used by man.

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$His\, powerful\, desire$ brought about his downfall.

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Although India is still $by\, far$ a poor country,it can become rich if its natural and human resources are fully utilised.

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The logic of the Berlin Wall $already\, had\, been\, undermined$ but when the news came through that the wall itself had been opened,$I$ jumped into a car.

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Not a word $they\, spoke$ to the unfortunate wife about it.

Improve the highlighted part of the sentence given below.
The greatest thing in style is to have a $use$ of metaphor.