阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Anne Hidalgo, the mayor of Paris, wants to clean the Seine, 【小题1】(make) the river swimmable by 2024 when the city will host the Olympic Games. Unfortunately, the Seine has a lot of pollution, which is the addition of harmful materials 【小题2】 the environment. Around 360 tons of plastic 【小题3】(find) in the Seine every year.

Lucky for Hidalgo, 11-year-old Raphael is on the case. For nearly two years, he 【小题4】(spend) nearly every weekend with his dad, fishing debris (垃圾) out of almost 【小题5】 whole stretch of water. It all started when Raphael saw a YouTube tutorial from someone doing something similar. So Raphael asked his parents for 【小题6】 (supply). “I was initially taken back by his request.【小题7】, once he showed me the YouTube video I ended up being quite impressed,” Raphael’s dad said.

Raphael feels 【小题8】(encourage) by his progress in the last two years. A section of the Seine, he said, is noticeably 【小题9】(clear) than the rest of the river. That’s 【小题10】 he started fishing and he hopes he’ll be one of the first to swim in the water once it’s declared safe.