When people think of tigers, they think strong and dangerous. But now, the big animal is calling for our help. There were once eight kinds of 1 in the world, but three died out during the 20th century. In the last 70 years, the 2 of Siberian tigers ( 东北虎 ) has gone from as many as 300 to 3 22 somewhere. The Siberian tiger has been 4 dying out completely. If the government doesn't make any efforts, it’s quite 5 that there will be no more Siberian tigers in China in ten to twenty years. In order to double the number of wild tigers in the 6 ten years, the World Wildlife Fund ( 世界自然基金会 ) has started a program recently. It 7 save wild tigers and put an end to tiger hunting and killing. China, together with twelve other 8 , has joined in. Wild animals, such as red deer and wild pigs, are the main 9 of the tigers. The hunting of these animals is the greatest threat( 危险 ) to tigers. So the most important thing is 10 the animals that tigers eat. To protect the wild tigers, we need to call on more people to stop eating and hunting wild animals.