A. There will probably be no school on Mars.
B. It might take us two or three days to get to Mars.
C. There is a problem for us to live on Mars.
D. Food will not be the same.
E. First, people will have more space.
Many people believe that, by the year 2100, we will live on the planet Mars(火星). Here is what life could be like.
First of all, transport should be much better. By 2100, spaceship can travel at half the speed of light.  【小题1】 
Secondly, humans need food, water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will provide us with food and air.
 【小题2】  We could easily jump too high and fly slowly away into space. To prevent this, humans on Mars have to wear special shoes to make themselves heavier.
Life on Mars will be better in many ways.  【小题3】  It is possible to live in a large building with many bedrooms. Then, robot will do most of the work, so we have more time for hobbies.
 【小题4】 Every student can study, do their homework on the computer and take exams in online schools. Each student will also have their own online teacher called “e-teacher”.
However, in some ways, life on Mars may not be better than that on the earth today.  【小题5】Meals will probably be in the shape of pills(药片) and will not be as delicious as they are today. Also, space travel will make many people feel ill.

We all dream about things that we would like to do and things. we hope      in the future. But are everybody’s dreams the same? Here are some of the    of a survey about hopes and dreams, which thousands of students across China      .
What are the hopes of teenagers?
We received several different answers    the question: what would you like to do after finishing your education? It seems some students would like to start work as soon as    , so that they can help     better lives for their parents. Other students hope to continue    after finishing school and to go to university.
What are the dreams of teenagers?
Teenagers have all kinds of dreams. Some are more realistic than others. But according to the survey, less realistic dreams are also        , but many students reported that they               work hard to achieve their dreams. Quite a few dream of becoming famous, perhaps famous sportspeople or singers. Some said they’d love to go on exciting trips; one student said she’d love to sail         the Pacific Ocean. And then there are dreams that are       three students said they’d like to be able to            !
Conclusion      It was clear from the survey      teenagers have similar hopes. It seems that most students hope to have a good education and find a good job. On      hand, students dream of very different things: good things, and even crazy things. It is very important to dream, so      your dreams; one day they may just come true.