In ancient times，the Four Great Inventions in China had a great influence on the whole world. In recent years，China once again has ____its ability to change the world with its “four great new inventions"：high-speed railways，electronic payments，bike-sharing and online shopping.

Do you know___ the new inventions can appear in China？The “four great new inventions” are ___related to China's high-tech innovation（创新）. For example，the operating ___ of bike-sharing is based on the satellite navigation system，mobile payment，big data and other high technologies. This shows that China's high-tech innovation has greatly_____the quality of people's lives.

China has entered a new innovative area，thanks to the large amount of ___ that China has spent on encouraging innovation. China is beginning to____in innovation in some ways.

“The‘four great new inventions' have surely improved customer experience，and helped national and global（全球的）economy ___at the same time，”said Charlie Dai，principal analyst（首席分析师）of an American market research company.

As a whole，all the Chinese are ____of their four great new inventions. It is increasingly clear that China is innovating and no longer copying Western ideas. More and more foreigners _____to promote（促进）economic development in their countries by learning from China's innovation.

There have been many great inventions that change the way we live. The first great _____ was one that is still very important today—the wheel. This made it easy for man _____ heavy things and to travel long distances. For hundreds of years after that, there were _____ inventions that had as much effect as the wheel. Then in the early 1800’s, the world started to change _____. There was little unknown land left in the world. People did not have to explore much any more. In the second half of the 19th century, many great inventions were made. _____ them were the camera, the electric light and the radio. These have all become a big part of our life today.

The first part of the 20th century saw more great inventions. The helicopter in 1909. Movies _____ sound in 1926. The computer in 1928. And jet planes in 1930. This was also a time when a new _____ was first made. Nylon (尼龙) came out in 1935. It changed the kind of clothes people wore. Of course new inventions continued to be made. Man began looking _____ ways to go into space. Russia made the first step. Then the United States made another. Since then other countries, including China and Japan, _____ their steps into space. In 1969 man took the biggest step away from earth.

______ first walked on the moon. This was certainly just a beginning. New inventions will someday allow us to do things we have never yet dreamed of.

Every school day, we use schoolbags to carry all of our things to school. They are a big part of our lives. But have you ever thought about the _________ of the schoolbag?

In the Han Dynasty, when old-style private schools were opened, students used bamboo boxes to carry books to school. People considered the bamboo box to be the _________schoolbag. There were usually two or three layers(层) in the _________. Kids put different things, like books, brushes, ink stones (砚) and paper in the boxes. You can see the bamboo box in many TV shows. _________, in the Legend of the White Snake, Xu Shilin carries a bamboo box to the capital to take an exam.

Hundreds of years _________, people developed a new kind of schoolbags called the “budai”, or the “hip-pocket“. The “budai“ was lighter than the bamboo box. With the founding of the People’s Republic of China, military rucksacks(军用帆布包) became popular. Ask your grandparents or parents about these bags. Maybe they can tell you about their _________ of carrying them when they were in school.

A new style of schoolbags has _________ in recent years. Many of them have colorful and fashionable _________ on them, such as pictures of cartoons or pop stars. And they are more comfortable to use. Some students pull wheeled bags _________ with heavy textbooks and others carry backpacks.

Schoolbags are still changing. Can you imagine __________ future schoolbags will be like?