1 . Do you want to find some books to read? If so, here is a list of them.

Adapted from the favorite trips of National Geographic’s travel writers, Journeys of a Lifetime crosses the globe to highlight the world’s most famous and little-known destinations. It presents lots of possibilities, from ocean voyage around Antarctica to horse riding in the Andes. Every continent and every possible form of transport is covered.

Destinations of a Lifetime takes you on a photographic tour of the world’s most impressive destinations. Hundreds of the most amazing locations—both natural and man-made—are illustrated with vivid images taken by the world-class photographers. Destinations of a Lifetime includes all the information: when to go, where to eat, where to stay, and what to do to ensure the most interesting experience.

Popular actor and award-winning travel writer Andrew McCarthy writes the foreword (序言) to this great book, offering 400 excellent destinations chosen by National Geographic’s family. It will appeal to active travelers looking for the next great trip as well as to the many readers who simply love dreaming of visiting faraway and peaceful destinations.

This collection of the 500 most unmissable sights and attractions in the world has been ranked by Lonely Planet’s global community, so big sights such as the Eiffel Tower and the Taj Mahal battle it out for a prized place in the top 10, making this the only list you’ll ever need.

3 . In the United States, most of our electricity comes from power plants(发电厂) that burn coal and oil.

There are two big problems with using these things for electricity. First. their supply is limited(有限的). Second, burning them causes pollution. So to make sure we always have power and to keep our planet clean, we must find other ways to make electricity.

Some people think that wind power is our best choice. First, there will always be more wind. Also, wind power does not pollute the environment. Best of all, we don’t have to search for wind.

Today, less than 1 percent of our electricity comes from wind. But scientists have been developing better wind machines. As a result, wind power is getting more popular in this country.

Yet wind power may not keep growing so quickly in years to come. Why not? Many wind turbines(风力涡轮机)are needed to make much electricity. So wind-power companies try to build wind farms but are competing(竞争)with other uses for the land. A wind farm is a group of turbines placed close together in an area with frequent winds.

In places where companies try to build wind farms, people think that lines of turbines are ugly. Noise from turbines often troubles people. Also, turbines kill birds that fly into them.

Wind-power supporters disagree. They think the sight of wind turbines is lovely. They point out that people have gotten used to living near noisy highways. They say ways can be found to keep birds away from turbines.

In today’s world, we need clean and unlimited power sources more than ever. Unless a better power source comes along, people may just have to accept wind power as a part of their lives.

4 . Blind people have long desired for brightness, but scientists don’t have the technology. To bring that one step closer to reality, Zhiyong Fan, a materials scientist of the Hong Kong University of Science and Technology, developed a new artificial eye recently. The device, which is about as sensitive to light and has sharper vision and a faster reaction time than a real eyeball, may outperform human eyes.

The human eye owes its wide field of view and clear eyesight to the retina (视网膜) — an area at the back of the eyeball covered in light-detecting cells. The design for a new artificial eye is based on the structure of the human eye and uses a friendly light-sensitive material. At the back of the eyeball, an artificial retina is lined with Nan scale light sensors (纳米级光感器). Those sensors measure light that passes through the lens (晶状体) at the front of the eye. Wires attached to the back of the retina send signals from those sensors to the processor, similar to the way nerve networks connect the eyeball to the brain.

“In the future, we can use this to replace damaged human eyes,” says the lead designer. In theory, this artificial eye could see more clearly than the human eye, because the artificial retina contains about 460 million light sensors per square centimeter while a real retina has about 10 million light-detecting cells per square centimeter. Besides, the artificial eyeball records changes in lighting faster than human eyes can — within about 30 to 40 milliseconds, rather than 40 to 150 milliseconds. Although its 100-degree field of view isn’t as broad as the150 degrees a human eye can take in, the device can see as well as the human eye in poor light.

Hongrui Jiang, an electrical engineer at the University of Wisconsin, though, thinks engineers need a much more practical and efficient way to produce vast series of tiny wires on the back of the artificial eyeball to give it superhuman sight, which is super hard to achieve.

8 . I believe that we get out of this world what we put into it. Usually, the rewards are indirect and sometimes hard to _________，but usually what you _________ comes back to you there and then!

A couple of days ago my step-son, Josh, was preparing for an event. Children from his primary school were going for their first trial day at the secondary school，so that they could know what they would meet after the summer holidays. A big _________ for a student!

I was in the middle of softie stuff when I noticed him _________ in a pot where we keep pens and pencils. In primary school they use pencils, _________ secondary kids get to write with pens. And Josh was looking for a pen. He came out with a(n) _________ pen that was missing a piece off the end. His _________ day deserved a pen better than that. So I _________ what I was doing and went to the drawer where my _________ pen lived. I would __________ that pen, but this was a special occasion.

“Josh,” I said in a deep，serious voice. “I __________ my pen which I like best to you, the next generation. Protect it well and cherish it. ” He smiled and said thanks. And I went back to go on __________. Coincidentally, that day was __________ my birthday, but we were just back from a weekend away and I wasn’t expecting any more gifts. Moments after the pen ceremony, Josh walked to me with a smile on his face and gave me a prettily packed box. __________, I opened it—and was even more surprised! Inside the box was a beautiful, brand new pen!

Almost like someone had planned it! It is so __________.Give and you will receive!

9 . Sumiel, a 71-year-old, was no stranger to the struggles of kidney (肾) disease. He was on the transplant list (移植名单), but no matches had yet _________. So he continued with his treatments at a medical center 30 miles from home.

One day, he took a taxi home after his _________ with the doctor. As they set out on the 40 minute _________ to Sumiel’s home in Salem, he and the driver, Letts, got to _________. Sumiel mentioned that he’d enjoyed _________ and helped others in his community before. But he was doing less these days because the treatments left him_________ tired. Then Sumiel revealed that he was _________ a kidney giver. Letts said, “I’d like to see if I could be a _________ to give you a kidney.” Sumiel agreed, though he didn’t _________ much of it as they kept driving.

Letts was __________ to his word. He got in touch with Sumiel just a few hours later, and by the next week, Letts had__________ the kidney transplant program. After a month’s long screening __________ — including an interview, sharing medical records, and testing the __________ were: Letts was an ideal donor, and he and Sumiel were a perfect match.

Fourteen months after they ended up in the same taxi by __________, Sumiel and Letts had their surgeries. It was a __________. They kept in touch and looked forward to the day they could reunite.