Please fill in the blanks with what you hear. 请根据所听内容填空。 Water is 1) __________ . We all need water. Most people drink about two liters every day. Water helps us stay clean, cook and 2) __________ food. In some countries, there is a lot of clean water. In other places, clean water is hard to find. This is a big 3) __________. Today 2.7 billion people don't always have 4) __________ water. By 2025, two-thirds of the world's people might not have enough water. Some places are always very 5) __________ . There is not a lot of rain. Sometimes people make cities in dry places. That is not a good idea. Other places do have enough water. But these places are not always 6) __________ about using water. People 7) __________ water. They water yards and golf courses too much. They water at the wrong time in hot weather. We can help save water, too. We can save water at home. We can take shorter 8) __________ . We can turn off the water when we clean the dishes or 9) __________ our teeth. We can clean our cars less often. Can you think of other ways we can 10) __________ water? Let's be wise. Then we can always have enough water.