一、根据句意及所给中文提示、首字母或英文解释，写出句中所缺单词，每空限填一词。
1. The first Earth Day was celebrated in 1970 to educate us to protect our (星球).
2. When studying at college, he always (连接) what he read with what he saw around him.
3. — Why could students watch space lessons online?
— Because the space station sent the video to the Earth through the (网络)!
4. This park was built (专门地) for children. You can see lots of children playing happily in it.
5. — Why are we trying to plant more trees these days?
— Because we want to stop the (增加) of pollution.
6. — How do you like the tomato and egg dish?
— It's so t. I'd like to have more with rice.
7. — Did you see the news about the new maglev train(磁悬浮列车)?
— Yes! It can run at a s of over 600 kilometers per hour. Many people are excited about it.
8. — What's the (the total number of people in an area, a country, etc. ) of China?
— It's more than 1.4 billion.
9. When the police arrived, they told all the (a person who rides in a car, bus, train, etc. but does not drive it or work on it) to get off and stay far away.
10. — Have you heard about our country's latest space station progress?
— Yes! The (happening in a short period of time) development of its technology surprises the world.

1. planet 2. connected 3. network 4. specially 5. increase 6. tasty 7. speed 8. population 9. passengers 10. rapid

二、根据句意或句子的语法要求，用括号中所给单词的适当形式填空。
1. It would take months (reach) Mars by spacecraft.
2. It sounds (challenge) to reach the top of the mountain within 30 minutes.
3. My teacher as well as my classmates (be) interested in exploring Mars.
4. A new type of spacecraft (show) at the Science and Technology Museum next week.
5. — How did you feel after the short walk in the park?
— I felt (relax). All the tiredness seemed to go away.
6. — Why do we wear seat belts in cars?
— They can stop us (get) hurt if there's a sudden stop.

1. to reach 2. challenging 3. is 4. will be shown 5. relaxed 6. getting

三、单项选择。
() 1.The weather of Harbin is colder than of Suzhou in winter.

A.that
B.those
C.one
D.ones

1. A

() 2.If you don't wear special boots, you may into space while walking outside.

A.float off
B.take off
C.leave off
D.put off

2. A