题目内容：

根据句意将将所缺单词补充完整。

We are beautiful red-crowned cranes（丹顶鹤）. We have red caps on top of our heads. You may think the caps are our f1.. In fact, they are combs(冠)。We are one of the largest birds in size in the w2.. We are the heaviest cranes（鹤）. An adult（成年）red-crowned crane can w3.up to 11 kilograms. We are good at dancing. I think we are the most beautiful dancers of all the birds. We are also good s4. We sing loudly and beautifully .We are good at flying as well, we fly to warm East Asia when s5. comes. We give birth to baby cranes there. We like to live together on wetlands in Southwest China and some o6. places. We feed on worms（虫子）and small fish. We like to live in long grasses. Water and grasses are i7. for us. But sometimes, life is harder these years. We are one of the most endangered（濒危）birds in the world now. People keep t8. our living areas to make farms and build houses.

We don’t have e9. space to live. And we don’t have enough food to feed our babies because many people go f10. and hunt too much. Can you help us!