I.
2. If there weren't so many billboards in our city, people could enjoy the view.
3. If there wasn't so much light in the city at night, we could see the stars clearly.
4. If we didn't turn on the heater all the time, we wouldn't have to pay three million dong for electricity a month.
5. If the karaoke bar didn't make so much noise almost every night, the residents wouldn't complain to its owner.
II.
1. Radioactive pollution is very dangerous since it can cause abnormal growth.
2. Leaves are damaged because the tree cannot get enough food energy to stay healthy.
3. If I had money now, I would buy a house in PhuCuong.
4. If light pollution didn't happen, there wouldn't be a change in animals’ living patterns.
5. Trees’ leaves are damaged because of the dangerous acid rain.