Read the passage and choose the option that best fits the gaps.
How To Stop Water Pollution
Water pollution ___(1)___ one of the biggest threats to the environment today. There are several sources of water pollution ranging from sewage and ___(2)___ to soil erosion. The impact of water pollution on wildlife and their natural habitat can be immense. There are also a number of things that the average person can do to help stop water pollution.
We should conserve the soil ___(3)___ soil conservation influences water pollution through erosion. As soil is eroded by water, it transfers sediment from the land to the body of water, which is polluted by the chemicals in the sediment. Phosphorus and industrial ___(4)___ can be pulled into water through soil erosion. When phosphorus levels in water become too high, they can lead to algae blooms that can ___(5)___ massive fish deaths and make water unsafe for human use. The best way to prevent soil erosion is to keep the banks of rivers well-covered with plants or trees. Planting trees can have a significantly positive impact on the reduction in soil erosion.