Origami is a Japanese word. “Ori” means “to fold” and “kami” means “paper” (kami changes to gami). And that’s what origami is—the ______ of folding paper to make beautiful models.

Origami is amazing! The only thing you need to do it is paper. Your hands are the only ______ you need. Cutting, gluing or drawing on the paper is ______. You only need to fold paper to create models.

Japanese origami started in the sixth century when people from China took paper to Japan. For many years there were no books ______ origami. People in Japan learned how to do it by watching other people.

In 1954, origami started to become ______ all over the world. A Japanese man called Akira Yoshizawa drew pictures to show ______ to fold origami models. Exhibitions (展览) of his work, both in Japan and around the world, _____ origami to many people. People all over the world started to make their own models. Now there are origami masters (大师) and ______ in many countries. There are also all kinds of origami organizations, ______ OrigamiUSA and the British Origami Society. Yoshizawa, who died in 2005 at the age of 94, is ______ regarded as the grandmaster of origami.

Each country and culture has its own set of public holidays and festivals. Some of these holidays and festivals like Christmas and New Year are common across the world. But there are many other holidays that are unknown.

Artificial intelligence (人工智能), or AI in short, is the science of giving computers and machines ability to think and work like humans. AI scientists and engineers have made a lot of cool technologies.

AI is rapidly catching up with the human ability to read faces. As a result, facial recognition (识别) is used a lot in the world. Chinese police use this technology to identify criminals (罪犯). Once they caught a criminal when he attended a concert. It also checks the ID of ride-hailing (网约车) drivers and lets people pay for things with a smile.

AI is also used in self-driving cars, which are believed to be the future of driving. Most drivers may wave or nod at passers-by to let them cross the street, but self-driving cars don’t have this ability. Car makers are testing a light signal system to help them “speak” to humans. The system can show what self-driving cars will do. For example, if a driverless car is yielding (让路), it will flash two white lights side to side. A rapidly flashing light tells passers-by that the car is about to speed up.

Service Robots also show you how powerful AI is. Imagine this—you come back home from school and your robot housekeeper is waiting for you at the door. After dinner, he teaches you to play the piano, just like a real music teacher. Such thoughts will soon happen in the real world. In the future, more and more service robots will become good home helpers.

AI is so powerful that it can help human beings and even replace us in many jobs.

I take the No. 10 bus to work at about eight every day. So I meet almost the     36     people on it. For many months, I noticed     37     elderly man get on at one of the stops.

He     38     a white T-shirt and a pair of blue jeans every day.     39     they were well worn（破旧的）, they were clean. I never spoke with this gentleman, but I could tell he     40     a not-so-rich life. One day, I decided to drive to work. I noticed the gentleman standing on a street corner, with a sign in his left     41     asking for money.

After I came back     42     that day, I wrote him a note in my study, saying I was thankful for what little I had in my life and that I wanted to share some of it with him. The next day I gave     43     the note and some money in a small envelope（信封）after he got on the bus. The next day, he handed me a note on the bus, too.

The note read:

Thank you very much for your kindness. I will     44     the money to buy next month’s tickets. Your note really provided me     45     a very pleasant and exciting start to the week. I hope you continue to enjoy a charmed（如有神佑的）life.

John

I will keep his note forever! We now smile and nod to each other on the bus every morning.