阅读短文，从方框中选择适当的词并用其正确形式填空，使短文通顺、意思完整。每空限填一词，每词限用一次。

later; for; work; different; why; he; be; joy; hundred; drop

Anand is from a city in the south of India. In 2017, he was 【小题1】 as an engineer at a car factory.

One day that year, Anand and his friends passed by a dirty lake (湖泊). All of a sudden, he fell over and 【小题2】 into the lake. When his friends pulled him up, he remembered that this lake used to 【小题3】 very clean several years ago. He wondered, “【小题4】 is it so dirty now?”

Anand planned to do something about it. He did a lot of study. Then, he found that this lake had once been part of a big network (网状系统) lakes. People built them to provide water 【小题5】 farmland (农田) about 1, 500 years ago.

Anand spent four months studying the network. And all this work won him a lot of prize money from 【小题6】 factory.

What’s next? Get people to join him! Luckily, Anand found 【小题7】 of volunteers. They began to work right away. By clearing the lake of waste, they opened up its blocked waterways (堵塞的水道). After that, they grew many plants around the lake. Six months 【小题8】, when Anand boated on the clean lake, he found that everything was getting better and better. So he was filled with 【小题9】.

Finally, Anand left his job to set up an organization to clean up more lakes for free. So far, it has cleaned up 35 lakes in the city. Anand’s work has not only made a big 【小题10】 to the environment, but also offered people clean water for farming and drinking. Anand really did a good job.