Read the following text and fill in each gap with a suitable word based on the information of the text: 

Water pollution can occur in oceans, rivers, lakes, ponds and underground reservoirs. As different water sources flow together, the pollution can spread easily and quiekly. Causes of water pollution include: 

• increased 
• erosion 
• improper waste disposal and littering 
• leakage of soil pollution into water supplies 
• organic materials that decay in water supplies 

In fact, polluting the land means polluting the water. Throwing away a toxic substance on the ground near a water source means it eventually reaches the body of water. As a result, the water is polluted. Industrial wastes must not be disposed in rivers or lakes. We need to be more careful about disposing household wastes too. Use of pesticides means that when it rains, chemicals used in the lawn or garden wash into the water bodies. Therefore, we must be aware of the dangers of using pesticides as they may pollute our rivers, canals and lakes. 

Water is all (a) ________ us. Everything on the planet needs water to survive. It is really (b) ______ to our lives. But water is being (c) _______ in different ways. People do unwise work and pollute water. To save ourselves we must take (d) ________ to stop water pollution. All  walks of people should be careful about the use of water. We should not waste water too. All water (e) _________ are in the threat of pollution or already polluted.