Seven new species of tiny frog __________ recently in the Brazilian rainforest. (discover), were discovered, Scientists believe that dinosaurs ______about 65 million years ago. (disappear), disappeared, Playing video games can ___________ people's brain activity. (impove), improve, Scientists say that 3D printing can now ________ to print human body parts. (use), be used, Recently, people in southern Australia ______by hundreds of spiders falling from the sky. (rain on), were rained, 'Spider rain, also known as 'ballooning, is how spiders _________ in groups from one place to another. (move), move, There are only five northern white rhinos left in the world. Can they __________ ?(save), be saved, Great white sharks can________ to 15-20 feet (4.6-6.1 metres) long. (grow), grow

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