About 800 years ago, a Chinese man ______ Wang Hu made the world’s first rocket, but unluckily he lost ______ life with it. It was not until April 24, 1970 that China sent its first satellite Dongfanghong-1 to space successfully.

To celebrate the first big success for the country’s space development, April 24 is now China’s Space Day, which started this year. While ______, China also announced (宣布) new plans to make a space station and go to Mars and further space.

A space station is like a ______ for astronauts in space. Astronauts live and work on a space station and spaceships can even park there. China plans to finish building its space station in 2022. ______ China’s top space scientist Zhou Jianping, by that time, becoming an astronaut will be a ______ job. Astronauts are needed more than ever before. They need to be able to finish more tasks. So far, China has been choosing astronauts mainly from pilots. In the future astronauts will also ______ picked from engineers, doctors and space technology experts.

Another plan is about Mars. In order to search Mars, China will send a probe (探测器) first to Mars in 2022.   It will land there and even bring back things ______ the Mars. It’s ______ a big plan! Only by doing this can China say it has truly started the exploration (探索)of deep space. And the exploration will help us understand ______ the universe (宇宙) changes.

In real life, robots are mainly used in factories. They do many different jobs. ________, those jobs are too dangerous, difficult or boring for humans.

Robots also help disabled people and people who cannot look after themselves. For example, scientists are making robots to ________ the blind. Now, only a few blind people have a guide dog to help them. However, in the future, there might be ________ robot dogs working as guide dogs than now.

Recently, one robot dog was ________. It is called Meldog. It has wheels and usually “walks” in front of its owner. It is very clever. It knows the ________ of its owner’s walk, so it will never walk too fast or too slow. Meldog talks to its owner by radio. The owner wears a ________ belt (皮带). This belt sends instructions to the owner from Meldog, such as, “Stop here”, “Turn left” and “Turn right”.

In the United States, another type of robot can help disabled workers ________ problems in their jobs. This robot, called Kilory. It can hear the sound of its owner’s voice and then ________ instructions such as “Turn the page” and “Make a cup of coffee”. Robots are also used in some American ________. They can do simple jobs. For example, they shave (刮胡子) patients, brush their teeth and take meals from the kitchen to patients’ rooms. It never gets lost because this robot ________ a map of the hospital in its computer memory.

Homes get smarter.

Most of us spend all day at school or work. After a long and busy day, all we want to do is return to a _______home. Smart technology can turn any home ________a nicer place to live.   Smart homes have been for _______. Scottish company Pico Electronics invented a type of technology _______X10 in 1975. With X10,householddevices (家用装置),such as lights and alarms, can communicate _______each other by using radio waves.

Of course, 5G networks have made smart homes much   _______than X10. Perhaps the most widely used smart home technology is the voice-activated assistant. Google Home and Amazon’s Alexa allow users to interact with nearly any device in ________ home simply by speaking a few words. This is especially _______for children and disabled people as they can do things ________would usually be too difficult according to How-To-Geek.

Common household appliances can become smart_________. According to How-Stuff-Works, a smart waste bin can keep track of the things you have _______away and place an online order for new items. Smart fridges can create dinner lists _______the food inside.

But it's not only about convenience. Smart homes are also perfect for the_______. By turning off devices that you are not using, smart homes can lower _______electricity you use. As we know using less energy_________ that we use fewer natural resources.