请认真阅读下面短文，并根据各题所给首字母的提示，写出一个合适的英语单词完整、正确的形式，使短文通顺。
Most people love animals. We think that animals are good f_________ of humans. But, in fact，a 1arge number of animals，especially wild ones，are in d_________ now mainly because of humans. If we do not t_________ action now，we will have no animals soon.
People are destroying animals’ natural habitat by cutting d________ trees or building houses. At the same time, many of the animals’ livinga_________ are becoming farmland as we have to feed a 1arger population of the world. Besides，people hunt animals for their fur or other useful things. As a result of the pollution that humans have caused, some animals cannot l_____ a normal life any more.
We must try our best to p_________ animals right now. Remember that it is everyone’s d_________ to do so. We should write to newspapers and magazines and t_________ everyone about these problems. We should also immediately d__________ something to help the endangered animals.