The universe (宇宙) is everything out in space. Nobody ______ how large the universe is. When we talk about the universe, we mean the Earth, the Sun, the Moon and all the ______ , and the space between them.

Now let me tell you something about the ______ . It is like a large ball. It ______ around the Sun. And ______ and land cover it. If you are in a spaceship and ______ the Earth from space, you will find that there are some blue parts. They are the seas.

We live on the outside part of the Earth. Around us is the air. It takes the Earth 24 ______ to turn in a full circle (整圈). When you see the Sun shining ______ , it’s the day for you. But when the Earth turns you away from the Sun, everything around you ______ dark(黑暗的).

Can you tell me something else about the universe? I think it is ______ and I want to learn more about it.

【推荐2】The universe is really mystical(神秘的). Scientists have done lots of study about it but there is still much they haven’t discovered. ___ think that people have lived on the earth for many many years. However, we haven’t found life on any other planets _____.

There _____ eight planets going around the sun. The earth is one of them. There are humans, animals, plants and many other kinds of _____ on the earth. There is water and air, too. And compared to the other planets, the earth is not too _____ or too cold. None of seven other planets has a(n) _____ like that of the earth.

The sun and its planets are_____the solar system, and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way. There are billions of_____ in the Galaxy, and our sun is only one of them.

Scientists have also_____many other galaxies in the universe. Their light has to travel for many years to reach us. So how______ is the universe? It is impossible to imagine______.

Scientists have sent spaceships to the planet Mars to take______photos. They have______ sent spaceships to travel outside the solar system. However, no spaceship has travelled far enough to reach other stars in _____ Galaxy.

When we see stars twinkling(闪耀) in the sky at night, we may think a lot:with so many stars in the universe, is there life out there in space? If there is life on other planets, what life will be like there? What transports do they use to travel______? Why don’t they visit us? We do not know the answers...

【推荐3】Long long ago, people _______ know much about the sun or the earth. They thought that the sun went round the earth. In _______ places, people even said the sun was a god. They thought that the god _______ across the sky every day on a golden horse.

Now _______ the help of scientists, we know that the earth _______ round the sun. It takes the earth a year to go all the way round the _______. Today men know how far it is _______ the earth to the sun. The sun is a star. It _______ much bigger than the earth. It looks smaller only _______ it is too far away. It is too hot for us to reach. Scientists ________ told us that the earth travels a thousand miles on its way round the sun.

【推荐1】What will life be like in the future? And what will we be able to do _________ 20 or 30 years?

Genetic engineering (基因工程) may _________ us make the perfect human. Babies may grow up to play _________ like Yao Ming. Also, we may be able to _________ the dead back to life. Maybe people will be able to meet and talk with _________ dead family members.

Nanorobots (纳米机器人) will play an important _________ in our life. They are _________ from the common ones. They are pretty small in _________, so they can even go into our blood vessels (血管).

Nanorobots will be good helpers for _________. Every year a lot of people die of cancer (癌症). With nanorobots’ help, __________, cancer will never be terrible. These robots are able to carry medicine into the human body. They will __________ cancer cells (细胞) and kill them without __________ healthy ones. More surprisingly, they can find their way out after they finish their work inside the human body. This may sound like a science-fiction story, but you can __________ it will come true some day in the near future.

Though there are all these changes, future man will still have a lot in __________ with us. He will still be a human being, with thoughts and motions __________ to our own.

【推荐2】Robots seem new to most people. _________, they have a long history. The first one was made by a Greek. There are lots of science fiction (科幻) _________ about robots, and the robots in the films are faster, _________ and cleverer than human beings and they are hard to be destroyed. In _________ life, robots are used to do many dangerous, difficult or boring _________. For example, some people can’t see, and they use dogs to help themselves move around. But in the future, robots dogs _________ take the place of these guide dogs. Some people can’t _________ themselves and robots can help take care of them.

Today robots are also used in American _________. In the hospital, a robot _________ meals from the kitchen to the patient’s room. It never loses its way because it has a __________ of the hospital in its computer system.

Robots can help us in many ways. However, they will never take the place of humans.

【推荐3】Life in the year 3044 is very different ____the life in the 21st century. We still do many of the things you did, but we do them ____.For example, we have e-friends to help us and keep us company(陪伴).An e-friend is a machine that looks just ____a human. It can walk and talk and can do almost____we humans do. My e-friend is a lot like me and we have____fun together. She helps me with my homework ____we often go swimming. She can take care of me if anything ____.so I always feel safe when we are together. She can also send me messages (信息)，just like old-fashioned e-mail, and I can download(下载)information from her memory.

It's great ____an e-friend----I am never lonely(孤独的)and I always have someone to talk____.I would like to tell you more about life in the year 3044,but I have to send my e-friend to clean up my room. Maybe____I will be able to travel back in time and visit you.