Life in the 21st century will be different from that in the 20th century, because  many changes       in the new century,       what will the changes be?
First, the population(人口) is growing very fast. There      more and more people in the world and most of them will live longer than before.
Computers will be      smaller and more useful, and there will be       one in every home. And computer studies will be one of the most important subjects in schools.
Second, people will work           hours than they did in the 20th century, and they’ll have more free time for sports,       TV and traveling. Traveling will be even cheaper and easier. And more people will go to other countries for holidays.
Third, there will be changes in our food, too. People will use more land       new towns and houses. Then there will be less room for cows and sheep, so meat will be more expensive. Maybe no one will eat it every day, instead, they will eat more vegetables and fruit. Maybe people will be         .
Last, work in the future will be      , 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.

A．take place B．take the place C．will happen D．took place

A．but B．and C．so D．or

A．will be B．will have C．are D．have

A．very B．quite C．much D．too

A．at most B．at least C．more than D．less than

A．few B．little C．less D．fewer

A．watch B．watching C．see D．seeing

A．build B．builds C．to build D．for build

A．unhealthy B．health C．healthiest D．healthier

A．dangerous B．difficult C．different D．the same