1.Noise pollution causes a change in animal's living pattern.
2.If I were you, I would recycle these plastic carrier bags.
3.Because of dangerous acid rain, trees' leaves are damaged.
4.Unless John change his way, he will end up in prison.
5.If there wasn't too much light in the city at night, people could see the stars clearly.
6.If I saw a UFO, I would take some photos.
7.Since radioactive can cause abnormal growth, it's very dangerous.
8.If we take action immedately, things will change for the better.
9.Let's me make your school clean.(Bạn nên thêm gợi ý vào câu này và nếu chưa rõ ràng để mình sửa nhé!)
Chúc bạn học tốt!