题目内容：

阅读下面短文，在空白处填入适当的单词或括号内单词的正确形式。

Despite many laws and national parks to protect tigers, their habitats continue to be destroyed and they are still hunted.1.(sad), tigers are among the most endangered species in the world nowadays. Altogether, there are no more than 5,000 tigers 2. (leave) in the wild. Some think that the tiger is already to the point of3.(die) out in the wild. There are many reasons 4.  this, like habitat loss and hunting.

Over the years, a number of steps 5. (take) to help preserve the tiger population. The Wildlife Conservation Society ( WCS) protects wildlife and habitats. Today WCS is carrying out work in 53 nations across the world, protecting 6.great variety of species from butterflies to tigers. In 2010, WCS started Tigers Forever, 7. aim was to increase the number of tigers in the world by 50 percent in the next 10 years. To achieve their goals,they are working together with governments and other8.(organize) which are willing to take strong and effective measures to protect tigers and other wild species

Right now the tiger population 9.(increase) under this program in India and in Far East Russia. Thanks to the hard work of WCS, these large cats have a chance of survival in their 10. (nature) environments and not just in zoos years.