China's Shenzhou-13 crew members Zhai Zhigang，Wang Yaping and Ye Guangfu livestreamed （直播） a science lecture from the country's space station on December 9，2021.
    At the beginning of the class，Wang，the first female astronaut to enter China's space station， （1）

gave

gave

（give） the students a tour of their living and working areas with the assistance of her two male crewmates.She showed their bedrooms，the toilet，a（2）

fully

fully

（full） functional kitchen，the area where they conduct experiments，and their fitness equipment，a spin bike（3）

included

included

（include）.
    After the tour，they conducted several scientific （4）

demonstrations

demonstrations

（demonstrate） under zero-gravity conditions.First，Ye demonstrated experiments related to the（5）

growth

growth

（grow） of cells in the zero- gravity environment in space.Ye and Wang explained（6）

why

why

astronauts cannot walk in space like they did on the ground and showed how they turn their bodies in the （7）

weightless

weightless

（weight） conditions.（8）

The

The

team also conducted an experiment to show how lack of gravity causes loss in buoyancy （浮力）.
    At the end of the class， （9）

to satisfy

to satisfy

（satisfy） students' curiosity，the three astronauts conducted a real time question-and-answer session. "The secrets of space and science are boundless，and the future is （10）

yours

yours

（you） "，said Zhai，commander of the Shenzhou-13 mission.