31. If you excercise more, you can have a good health.
32. Too mane telephone poles, advertising billboards or shop signs cause visual pollution.
33. If we don't take action immediately, the air will become completly polluted.
34. Both weeds and aquatic plants die of herbicides.
35. If many people respect environment, it isn't now in danger.

1. If you don't exercise more, you won't have a good health.
2.Too many telephone poles ,advertising billboards or shop signs make visual pollution happens.
3.If we don't take action immediately,the air will become completely polluted.
4.Both weeds and aquatic plants die of herbicides.
5.If many people don't respect the environment , it will be in danger.
6.Since the water is contaminated , people get more diseases .
7.Because of breathing in unclear air, my uncle suffered from lung cancer.
8.The street will look attractive if people stop throwing rubbish in street .
9.Due to the heavy rain , the road in front of my house was flooded.
10. Light pollution many result in too much use of electic lights in cities.

36. Since the water is contaminated, people get more diseases.
37. Because of breathing in unclear air, my uncle suffered from lung cancer.
38. The street will look attractive if people stop throwing rubbish in the street.
39. Due to raining heavily, the road in front of my house was flooded.
40. Light pollution many result from too much use of electric lights.

co ban nao biet ten quyen sach cua ban ay khong neu co thi cho minh xin ten voi a??