Allan Maman, a young man growing up in New York City, was always thinking and trying. When fidget spinners (指尖陀螺) first came out, he was extremely _________. As a young man with a disease called ADHD, the constant _________ of the spinner looked very interesting to him, but he found the products to be of poor _________ and over-priced.

Instead of waiting for someone else to _________ it, Allan decided to make one. He found a blueprint online and used his high school’s 3D printer to _________ with. Then Allan asked his science teacher to help him learn how to use the _________. He created his first fidget spinner and _________ it with his classmates, who soon became so crazy about it. Everyone became _________ to possess one. So Allan started to make more fidget spinners.

With the orders _________, he bought his own 3D printer. He and his Mend, Cooper, had to work long hours to keep up with all of the orders. Their business took off __________.

They ordered more 3D printers and __________ a shop in their basement. Allan and Cooper paid their school classmates to help assemble (安装) and __________ the orders. All in all, they sold over $350,000 worth of fidget spinners! Their __________ was presented in many national magazines and TV shows. Allan is now moving on to other __________ . His long-term goal is to create more great businesses and then give his __________ back to worthy causes.

Medha Gupta sometimes felt worried making the 20-minute walk from the corner where the school bus dropped her off to her home in Herndon, Virginia—especially during the colder months in winter.

Her mother, Divya Gupta had a ________: write an app. She was half-kidding, but Medha took the challenge ________. So she went to work.

The result was Safe Travel, an app ________ by Medha to help walkers feel more ________ when travelling alone. Using the iPhone, a person can programme it to send a warning to someone he or she trusts if he or she ________ to arrive at a destination within a certain time.

It was the first IOS app that Medha had created. While she didn’t think much would come from the project, her ________ caught the eye of judges for the annual Congressional App Challenge, who selected her as the winner for Virginia’s 10th District.

The App Challenge is designed to encourage ________ to consider careers in science, technology, engineering, and maths by ________ coding and computer science. Winning students are ________ to attend a reception on Capitol Hill in April and also received $ 250 in Amazon Web Service credits.

Medha said it took her about 40 hours to design, ________ and test the app. As for her next app, Medha’s not certain. She ________ has her app-development tasks on hold because she’s ________ teaching herself AI to help deal with improper words on Facebook. Yes, she knows that there are teams of ________ probably doing the same thing. But she ________ it can’t hurt her own part, too.

“If we see something ________ with the world, we should do something about it,” she said. “After all, the only one stopping us from doing something is ourselves.”

Can you imagine what life would be like if there were no telephones? You could not call up your friends on the phone and talk to them. If fire ______ out in your house, you couldn’t call the fire department. If somebody were ______, you couldn’t call a doctor. In our ______ life we need to communicate with one another. We do this ______ by speaking to other people and listening to what they have to say to us, and when we are ______ to them we can do this very easily. ______, our voices will not travel very far even when we ______ and it is thanks to the ______ of the telephone that we are ______ able to communicate with each other when we are far apart (分开). We can ______ each other clearly as if we were in the same room. The man who made this ______ was Alexander Graham Bell, a Scotsman, born in Edinburgh in 1847. Bell, a teacher of visible speech (可见语言) who later moved to Canada, ______ all his spare time experimenting. ______ enthusiastic was he in his research for a means of ______ speech by electricity that he left ______ time for his day-to-day work and at one time he was almost penniless (一文不名的).