A. B. C.
D. E. F.
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Children, I'm going to talk about fire safety. Fires start in the countryside and in our homes. We should be. In the countryside, people should not in the forests. People should not the fire burning after . At home, children should not cook an adult. Children should not play near the fire.
— . How about having a barbecue in front of our house tomorrow?
Carl his money in a fare box on the bus yesterday.
does the boy weigh?
people save the Earth?
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. At present. our spaceships are too slow to carry a large of people to Mars--it takes months. However, by 2100, spaceships can travel at half the speed of light. It might take us two or three days to get to Mars.
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.
There is a problem for us to live on Mars. 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. First, people will have more space. It is possible to live in a large building with many bedrooms. Then, robots will do most of the work, so we have more time for hobbies.
There will probably be no school on Mars. Every student can study, do their homework on the computers 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. Food will not be the same. 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.