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The world is now using 10 times as much water as it did 100 years ago.Scientists say that by 2020 water shortage will be a big world problem.It's time for all of us to learn to s___ it.People use more water in the bathroom t___ any other place in the home.Turn off the water when you brush your teeth.Keep your showers s___ as a shower uses 10 to 20 liters of water a minute .This way you'll save thousands of liters of water a year,and reduce your water bill.A large amount of water is used for w___ lawns and gardens.Never water your flowers or lawn at the h___ times of the day,or when it's windy.Try using rain water.Plant flowers or grasses that need l___ water.These ideas may seem strange,but they are very helpful.