1.          Life in the 21st century will be different from lire in the 20th century because many changes will take place in the new century．But what will the changes be?   

    The population is  1  fast．There will be more and more people in the world and most of them will live 2than before，because life will be better．3 will be much smaller and more useful，and there will be at least one in every home．And computer studies will be one of the important 4  for students at school．People will have more free time for sports and  5 TV．Travelling will also become  6   because of modern transportation(交通)．There will be changes in our food，too．More land will be used for building new towns and houses．Then there will be less room for cows and sheep，so  7  will be more expensive．Maybe no one will eat it every day．  8 ，they eat more vegetables and fruits．Maybe people will be healthier．Work in the future will be  9  ，too．Dangerous and hard work will be done by robots．Because of this，many people will 10  their jobs. This will also be a problem．