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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