Cho các từ sau và điền chúng vào ô trống thích hợp:
aquatic accumulated catchment pollutants
sustain containing discharged rubbish
River pollution occurs when (1) are not removed from sewage and are discharged into the river. River water is a very important source of freshwater required to (2) life. We need a constant supply of fresh water for drinking, cooking and washing. Animals living near the river, as well as fishes and (3) plants, also depend on clean river water. When heavy rainfall occurs, pollutants (4) within the boundaries of the (5) area may be washed into river (6). These pollutants include a variety of agrochemicals like fertilizers and (7). Waste water (8) cleaning detergents, oil and other pollutants like industrial waste may be (9) into the river channel through our drainage systems. Industrial waste may contain sulfur, resulting in increasing the acidity of the river water. Sometimes, (10) such as plastic bags and bottles, are also washed into the river channel.