一、语法填空(根据课文内容完成短文）
Many wild plants and animals have died out during the long history of the earth. And dinosaurs are the 1________ (much) famous of the animals. They came into being much 2________ (early) than humans. There were many different kinds of dinosaur. Eggs and bodies of dinosaurs 3________ (discover) in some places of China. However, dinosaurs died out suddenly. Maybe 4________ is because of a(n) 5________ (expect) incident 6________ a huge rock from space hit the earth. Maybe that the earth got too hot for the dinosaurs to live on any more caused their 7________ (extinct). No one knows 8________ sure why and 9________ dinosaurs disappeared from the earth in such 10________ short time.
