We know much about the universe(宇宙). It means the earth, the sun, the moon and the stars and the spaces between them.

Most of the stars are bigger than the moon, but they look much 【小题1】. Because they are far 【小题2】 from the earth. At night, the moon is high in the sky like a light. But the moon has no light of 【小题3】 own. The light of the moon comes from the sun. The sun gives us light, heat and life. And the plants, animals and men will die 【小题4】the sun.

The earth is going round itself all the time. 【小题5】 the part of the earth turns to the sun, it is day. The opposite part of the earth is night.

The earth is our homeland. We should love it.

Are you interested in space travel? It 【小题1】 (report) that space will soon be a popular place to go on a holiday by 2050. One Japanese company is 【小题2】 (plan) a space holiday center. It will look like a bicycle wheel with a hotel and a theme park. It will travel around the Earth at a 【小题3】 (high) of 300 km. The leaders of the company say that 【小题4】 (fly) to the center will be faster than that from Hong Kong to Singapore. 【小题5】 the space trip will cost about 10,000 dollars, the company still believes lots of people can afford it. And years later, the trip will become much 【小题6】 (cheap). Of course, the tourists will be treated better as well.

Recently, an American hotel group is also thinking of building 【小题7】 unusual hotel called the Lunar Hotel. It'll probably be ready by 2049. This will be on the moon. Most of the hotel will be under the ground, so it will be 【小题8】 too hot nor too cold. The guests will eat food for lunch 【小题9】 (normal). The cooks will just mix dried food with water 【小题10】 (make) instant meals.

Humans may live on another planet one day! That 【小题1】 (seem) impossible years ago. But now the idea may come true. According to Stephen Hawking, a British 【小题2】 (science), humans only have about 1,000 years to live on the earth. It means that humans 【小题3】 (fly) to another planet in 1,000 years. In fact, we have found one red planet Mars (火星). Experts have found that there 【小题4】 (be) water on it. The idea of living there looks possible. Thanks to science, the steps to Mars are getting 【小题5】 (fast) than before. For example, in 2013, Dutch experts 【小题6】 (plan) the first plan to put humans on Mars. They offered people one-way tickets to go and build a new home on Mars. 【小题7】 it was dangerous, over 200,000 people still wanted to take part in it. 【小题8】 the evening of September 21, US experts showed another plan to get humans to Mars in six years. They are also doing many 【小题9】 (prepare) to help people get back to the earth. I’m looking forward to 【小题10】 (live) on Mars. Will you join us?