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 the animals 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)．