根据句意及汉语提示完成单词。

①This kind of plant is very ____ (稀少的). It's difficult to find it.

②Scientists are doing____ (研究) on how to clean the polluted river.

③This ____ (情况) often happens to people who travel by car.

④I don't think it's right to ____ (杀) animals.

⑤Lucy was ____ (发狂的) when she heard Michael Jackson's death.

⑥People need to help theanimals live in ____ (安宁，和平).

⑦Tell me the ____ (原因) why you were late.

⑧If I have ____ (足够的) money, I'll buy a big house.

⑨Our ____ (政府) is working hard to save pandas.

⑩All of us should love our beautiful ____ (大自然).