阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式（每空最多1个单词）

Goldfish may look small and cute in your home, but in the wild, it’s a different story. Releasing them into your local stream or lake is 【小题1】 bad idea. Right now, Washington State 【小题2】 (fight) off an invasion (入侵) of goldfish! Thousands of goldfish are living in the West Medical Lake in large 【小题3】 (number) and are crowding out the native fish population. How did this happen? The Department of Fish and Wildlife thinks a few irresponsible pet owners are 【小题4】 (blame). And while the goldfish may have cost the owners a few dollars, this mess is going to cost the state about $150,000 to try to remove these harmful fish. But this isn’t the only place 【小题5】 this is happening. Goldfish are invading lakes and streams worldwide, and it’s all our fault. 【小题6】 you think you’re doing the goldfish a favor by releasing it, you’re wrong! Instead, you’re setting the stage for a(n) 【小题7】 (ecology) disaster, which could threaten hundreds of other species. It turns out that goldfish are one of the world’s 【小题8】 (bad) invasive species. They introduce diseases that destroy the 【小题9】 (delicate) balanced ecosystems wherever they go. And they aren’t happy to stay in one place and will travel across many bodies of water. So 【小题10】 (think) twice before throwing that goldfish away.