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　　Water Shortage
　　Getting water seems (seem) so easy for many people. You will be（41）(mistake) if you think there is an （42） (end)supply of water. In fact，the world has a water shortage. Seventy percent of the world is （43） (cover) in water. But most of it is salt water. Only a small（44）(percent) is fresh drinking water. Countries （45） (include) Spain, Italy and South Africa actually import water from countries such as the United States and Australia. （46） (surprising), 1.1 billion people on earth have difficulty （47） (get) clean drinking water. This global problem is predicted to get （48） (bad) as the atmosphere becomes warmer.
　　Every person in Britain （49） (use) about 150 litres of water a day. In some countries people only have 5 to 10 litres a day! They would be （50） (shock) to learn how we waste drinking water.