阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。
In the Ming Dynasty, a Chinese man 17 (name) Wan Hu made the world’s first rocket, 18 unluckily he lost his life with it. It was not until April 24, 1970 19 China launched(发射) its first man-made satellite Dongfanghong-1 successfully. To celebrate the first big success in the count’s space 20 (develop), we now make April 24 China’s Space Day.
China also announces new plans 21 (make) a space station and go to Mars and further space. It will finish building its space station around 2022. According to China’s top space scientist Zhou Jianping, at that time, 22 (become) an astronaut will be a normal job. More astronauts are needed than ever before. They need to be able to finish difficult 23 (task).
By now, China has been choosing astronauts 24 (main) from pilots like Yang Liwei. In the future, astronauts 25 (pick) from engineers, doctors and space technology experts. Another plan is about Mars. In order to explore Mars, China sent a spacecraft(航天器), whose name is Tianwen-1, 26 Mars on July 23,2020. It will land on Mars and even bring back things from Mars.