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。

To protect the ocean and prevent plastic waste polluting the water, an Italian company has invented River Cleaning, 【小题1】 seems to be a perfect tool for picking up litter before it gets there. About 80 percent of ocean waste comes from 100 of the 【小题2】 (large) waterways across the world. So, stopping waste at its source is 【小题3】 excellent potential solution.

However, the company had to overcome several 【小题4】 (difficulty) before it could test out the invention 【小题5】 (proper). For example, its device had to allow boats to easily pass through, while being able 【小题6】 (run) 24/7 with no impact on the environment. The result is River Cleaning, a 100 percent effective, low cost, low impact solution.

Attached 【小题7】 the bed at the bottom of the river, River Cleaning is a series of buoys (浮标) that powered by the 【小题8】 (nature) flow of the river. It has the ability to collect different kinds of waste. So far, studies 【小题9】 (show) River Cleaning can collect 85 percent of all waste passing by it. So, if it is used in all the right places, that’s up to 85 percent of trash prevented from 【小题10】 (enter) flowing into the ocean.