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Text 1 The past 40 years have witnessed an extraordinary evolution. From slow expensive machine...

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proves that the epidemic has been spreading very fast over the past eight years  implies that the USAID was not very successful in the past eight years  shows that the epidemic has spread too fast to be controlled over the past eight years  explains that the epidemic has been controlled  
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40 years old; an 11﹣year﹣old

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the; /  an; a  the; the   /; a  
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