短文填空。（共16分，每空2分）
Life in the 21st century will be different from t     in the 20th century, because many changesWill happen in the new century, and what will the changes be?
First, the population is g   very fast. There will be more and more people in the world and most of them will live longer than before. Computers will be m    smaller and more useful, and there will be at l     one in every home. And computer studies will be one of the most important subjects in schools.
Second, people will work fewer hours than they did in the 20th century, and they’ll have more free time for sports, w  TV and traveling. Traveling will be even cheaper and easier. And more people will go to o  countries for holidays.
Third, there will be changes in our food, too. People will use more land to build new towns and houses. Then there will be less room for cows and sheep, so meat will be more e . Maybe no one will eat it every day, instead, they will eat more vegetables and fruit. Maybe people will be healthier.
Last, work in the future will be d     , too. Robots will do the dangerous and hard work. Because of this, many people won’t have enough work to do. This will be a problem.