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Millions of years ago , dinosaurs ____________________ ( walk ) the earth . Some dinosaurs ____________________ ( hunt ) . They ____________________ ( be ) carnivores and ____________________ ( eat ) meat .
The most dangerous dinosaur ____________________ ( be ) T - rex . It ____________________ ( have ) big teeth and ____________________ ( can ) run fast .
Most dinosaurs , like the diplodocus , ____________________ ____________________ ( not eat ) plants . One of the smallest dinosaurs known , ____________________ ( be ) only about as large as a chicken , 60 ? 90 cm long , including the long tail .
For a long time people ____________________ ____________________ ( not know ) anything about dinosaurs . A man called William Buckland ____________________ ( find ) the first fossil of a dinosaur in 1819 . In 1941 , Sir Richard Owen ____________________ ( come ) up with the name 'dinosaur' , which means ''big , scary lizard " .

What happened to the dinosaurs ? Why ____________________ they ____________________ ( die ) ? 65 million years ago , an asteroid ____________________ ( hit ) the earth and the dinosaurs ____________________ ( become ) extinct .