短文改错 （共10小题，每小题1分，满分10分）
This summer, I paid a visit in my hometown. What made me really sad was that it had changed a lot of.
In the past, my hometown was very beautiful, with small river  run through the village. Tall and straight trees, beautiful flowers or green grass could be seen everywhere. Nowadays, therefore, with the development of modern society, people are living a “happy” life.  Many tall building are found on both sides of the river, but the river has been bad polluted as waste water runs directly into it and there is now few fish swimming in it. It was time to take measures to protect our living environment.