The Warrens are a common family. However, this common family has done something _______. A few years ago, they moved to the countryside and built a house which was powered (提供动力) by the wind and the sun!

Mr. Warren wanted his family to play a role in _______ the planet, so he read a lot about the electrical system. Then, he _______ to create electricity to power everything they needed for their daily lives.

The kids were _______ at first. “Will we still be able to watch TV? What about the computer?” they asked. “Don’t worry at all,” said their father. “Just because we are going to create our own electricity doesn’t mean we have to live in the _______.”

“We are going to set up a wind generator (发电机),” explained Mrs. Warren. “Wind is a great way to _______ electricity. It’s not only free but also clean. The wind doesn’t blow all the time, though. That’s _______ we need to store (储存) our power. Then, when there is no wind, we will still have power to run everything in our house.”

Mr. Warren added, “We are also going to collect _______ from the sun and turn it into electricity. So, when the wind blows, we have power. When the _______ shines, we have power, too.”

It’s easy to see that the family really _______ renewable energy. Now, they are living happily in their self-powered countryside home.

Sit With Us

You’re at your new school. It’s lunch time, but you don’t have anyone to sit with. You want to join someone at their table, ______ you’re not sure if they’re friendly. What do you do? Natalie’s ______ of solving the problem was to create an app. She knows what it feels like to be alone at a new school. She found it difficult to make new friends and had to ______ a new table at lunch every day. If she sat ______, she felt lonely. But if she asked to join someone and was ______, she felt embarrassed. She created a lunch-planning app to help students like _______ find people to have lunch with.

The app-called Sit With Us—is ______. If a student is having lunch in the afternoon, he or she can create an invitation. Other students can open the app and ______ that invitation. They can then use the app to decide when and where to ______. This allows students to make ______ online instead of face-to-face. This is the reason why it works so ______: it lowers the risk of being refused, and the embarrassment that goes along with it.

Natalie is ______ to see that people are replying to her app actively—especially those who suffer from bullying(遭受欺凌). Soon after she made her app available to the public, she won a prize for it. She ______ appeared in many news stories.

Natalie was even asked to speak at a university. In her ______, Natalie wanted people to know that you don’t have to do something ______ to change lives. Sometimes, a simple thing—like having a friend to enjoy lunch with—can make all the difference.

Take a piece of hair from your head. Ouch! It may be long, _______ it's not wide. Three scientists spent over 30 years _______ a kind of machine. This kind of machine is about a thousand times _______ than the width of one piece of your hair. These machines are _______ small that they can only be seen under a microscope(显微镜)!They _______ nanomachines(纳米机器).

Because of their hard work, the three scientists _______ the 2016 Nobel Prize in Chemistry. They are all European. Sir J. Fraser Stoddart, one of the scientists, told reporters that he thanked _______ other scientists from 24 different countries for helping make this prize _______. He said he once brought a chocolate Nobel Prize to his daughter from _______ trip to Stockholm. He expected ____________ a real one someday.

What are nanomachines good for? Scientists believe that ____________ the future, nanomachines ____________ help deliver(传送) medicines inside a person's body, or take away things that are making us sick. Mr Feringa compared ____________ work to that of the Wright Brothers. When the Wright Brothers flew their airplane for the first time, some people questioned what airplanes ____________ good for. Now airplanes help us ____________ fast and we use them all the time.