The global birth rate … - has been falling steadily in many countries, but rising in others., These days we are at risk … - of running out of oil and gas in the next decades., Recently, there has been a lot of research … - in using AI to give people faster medical results., Scientists don’t know what causes … - cancer cells to grow in some people but not in others., Our country has invested billions … - into better hospitals and cancer treatment., We still can’t predict … - future earthquakes or exactly how climate change will affect us., We should invest more in … - new sources of energy, like wind or solar.,

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