On March 20, students enjoyed the latest course by astronauts (宇航员) on China’s Tiangong space station. The astronauts showed unusual activities in the special ______.

The three members of the space station ______ on the television screens in front of millions of Chinese students. They were happy to share scientific ______ about space flight with students.

During the 41-minute ______, the astronauts carried out several experiments (实验). In one experiment, Wang Yaping used a toy of Bing Dwen Dwen to ______ how objects fly in the space environment.

Before ending the course, the astronauts ______ the questions from students. The questions ______ all ways of life and work in space. For example, how do they take care of their skins (皮肤)?   ______ hot water was available (可用的) or not?

This was the third time for Wang Yaping to give a lesson in space. She gave the first lesson nine years ago. It made China the second ______ after America to give a lesson to school children from space. The second happened in early December in 2021. Some teachers said her lessons would make more students be ______ in science and technology.

Recently, there has been the first meeting of the Youth Peking Opera Performers. It has been shown live on TV and online. It started on Nov 9th, ________ young watchers a chance to get closer to this traditional art form and have a better understanding of it.

Around a hundred young performers joined in this meeting. ________ on TV, people could also watch it on the website of CCTV.

With the new technologies like 5G, 4K and AI, this show ________ brought this art form from traditional theaters to both small and big screens. It also provided the young performers with a place to show their ________.

Li Jia, a young performer from the Jingju Theatre Company of Beijing, said ________ was her duty to carry on this traditional art from her grandmother and mother. “When I was young, I got to know that they loved the art form deeply, practiced it very hard every day, and took it as a career (职业). I was moved by them and decided to ________ this beautiful art form”, she told the reporter.

________ the young performers showed their true love for this traditional art form on the stage, young watchers around China could see their many years’ hard practice. After seeing it, the young watchers got ________. At the same time, young watchers could also feel the beauty of the art and fell in love with it. It was good for the spread of Chinese culture.

Peking Opera is a performance art form ________ includes singing, acting and martial arts (武术). In the show, experienced performers and experts were also invited to introduce the background information and knowledge about Peking Opera. It not only taught the young watchers a lot ________ helped spread the art.

How has technology made your life easier? When you go to a shopping mall, you can ______ free Wi-Fi there. When you want to take a taxi, you can book one with your phone. In fact, all of these things can be seen as the first building blocks of a smart city.

The ______ of a smart city was first suggested by tech company IBM in 2010. Generally, a smart city is a city ________ uses digital (电子的) technology, such as 5G network s and the “internet of things”, to improve urban planning, save money and resources (资源), and make our lives more convenient.

Cities ______ Boston, Amsterdam and Copenhagen are already using smart technology to improve public services. In the US cities of Boston and Baltimore, smart rubbish bins (桶) can sense how ______ they are and tell workers when they need to be cleaned. In Amsterdam, traffic is monitored (监测) and adjusted according to real-time data gathered from sensors around the city. There are ______ traffic jams.

Smart cities will allow us to ______ resources. By using sensors and 5G networks to check the usage of water, gas and electricity, city managers can make sure how to use these resources more efficiently. For example, water and gas pipes (管道) could ______ repair workers when there is a leak (泄漏). Air pollution could be more closely monitored, too.

Of course, ______ will take time to build the smart cities of the future. But since we’ve already seen successful examples, it won’t be long ______ more cities join in. Tech Republic estimates (估计) that by 2050, about 60 percent of people worldwide will live in smart cities.