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Four scientists have [win / won] the 2016 World Food Prize. The scientists are from the [globally / global] agricultural research group the International Potato Center. They won the prize for enriching sweet potatoes. This has resulted [on / in] health benefits for millions of people across [the / a] world. The scientists developed a way to [grow / growth] sweet potatoes that have extra amounts of Vitamin A in [there / them] . More Vitamin A means the sweet potato contains extra [nutrition / nutritious] . One researcher said it was [difficulty / difficult] to get farmers to help him with his work. Many farmers did not think it was a good idea. The researcher said: "They told me it was a bad idea. Their job was [to / for] increase yields, pest resistance and reduce poverty; it wasn't [to / too] improve nutrition."

The sweet potato could change the lives of [much / many] people across the globe. People without food can [die / dead] of malnutrition – not having enough to eat. A lack of Vitamin A is one of the most [harm / harmful] examples of malnutrition. Scientists say malnutrition [affects / effects] more than 140 million children up to the [old / age] of four in 118 countries. It also affects [over / more] than seven million pregnant women. Scientists also say it is a big [reason / reasons] for children becoming blind in developing countries. Jan Low, from the International Potato Center, said the prize-winning sweet potatoes could make a big [different / difference] in making sure hungry people get enough Vitamin A. She [hopes / hoping] more scientists will focus on increasing nutrition in [vegetable / vegetables] .