Are you interested in space knowledge? If so, meet our astronaut _______ , Jing Haipeng, Zhu yangzhu and Gui Haichao! On September 21, 2021, the three shenzhou-16 astronauts gave the fourth Tiangong class from _______ to students on the Earth.

This was the first _______ class from the Mengtian lab module (舱). The 48-minute-long class had three parts. First, the three astronauts talked about their life in the module. Next, they did four interesting _______. In one of them, two astronauts lit a candle. They _______ students to do the same experiment on the Earth to find out the differences. At the end of the class, some students asked the astronauts some questions that they were most interested in, and the astronauts answered them _______. Around 2, 800 students had the class in five classrooms that were set in five _______ cities. The main classroom was in Beihang university in Beijing. Gui Haichao _______ at the university as a teacher before he became an astronaut of shenzhou-16. More than 2,400 students and teachers from the university and primary and middle schools went to the main classroom. “I can have the science class from space, so I felt excited. I was most interested in the candle experiment,” said a primary school student from Beijing. “I really _______ to fly to space someday.”

The “Tiangong class” was surely ________. An increasing number of young people are becoming interested in space. And the Tiangong space station plays an important role in science popularization (普及) and education.

【推荐3】July 20, 1969 was an important day. Two Americans landed (着陆) _______ the moon. Their _______ were Armstrong and Aldrin. They went in a spaceship, and its name was Apollo 11. Apollo 11 left Cape Kennedy (肯尼迪角) _______ July 16 and went 385,000 km. The journey _______ three days. On July 20 the space ship landed on the moon. Armstrong _______ onto the moon. The two men moved about on the moon. They picked up some rocks and put them in the spaceship. They jumped up and _______. Then they put a flag on the _______. They were tired after their moon trip, so they took a _______. On July 21 Apollo 11 _______ the moon and returned to the earth. Three days later it came down in the sea. A ship ________ them back to America and to their families.