1 . Molai grew up in a tiny village in India. The village lay near some wetlands which became his second _______. He learned the value and beauty of _______ there from a very young age. 

When he was 16, Molai began to notice something _______ happening around his home. A flood had hit the area earlier that year and the _______ it caused had driven away a number of birds._______, the number of snakes had declined as well. He _______ that it was because there weren’t enough trees to protect them from the _______. The solution, of course, was to plant trees so the animals could seek _______ during the daytime. He turned to the _______ department for help but was told that nothing would grow there. However, Molai went looking on his own and ________ a nearby island where he began to plant trees.

________ young plants in the dry season was ________ for a lone boy. Molai built at the ________ of each sapling (幼树) a bamboo platform, where he placed earthen pots with small holes to ________ rainwater. The water would then drip (滴落) on the plants below.

Molai ________ to plant trees for the next 37 years. His efforts have resulted in 1,360 acres of naturally-grown land that has become home to many plants and animals.

2 . When John Todd was a child, he loved to explore the woods around his house, observing how nature solved problems. A dirty stream, for example, often became clear after flowing through plants and along rocks where tiny creatures lived. When he got older, John started to wonder if this process could be used to clean up the messes people were making.

After studying agriculture, medicine, and fisheries in college, John went back to observing nature and asking questions. Why can certain plants trap harmful bacteria (细菌)? Which kinds of fish can eat cancer-causing chemicals? With the right combination of animals and plants, he figured, maybe he could clean up waste the way nature did. He decided to build what he would later call an eco-machine.

The task John set for himself was to remove harmful substances from some sludge (污泥). First he constructed a series of clear fiberglass tanks connected to each other. Then he went around to local ponds and streams and brought back some plants and animals. He placed them in the tanks and waited. Little by little, these different kinds of life got used to one another and formed their own ecosystem. After a few weeks, John added the sludge.

He was amazed at the results. The plants and animals in the eco-machine took the sludge as food and began to eat it! Within weeks, it had all been digested, and all that was left was pure water.

Over the years, John has taken on many big jobs. He developed a greenhouse — like facility that treated sewage (污水) from 1,600 homes in South Burlington. He also designed an eco-machine to clean canal water in Fuzhou, a city in southeast China.

“Ecological design” is the name John gives to what he does. “Life on Earth is kind of a box of spare parts for the inventor,” he says. “You put organisms in new relationships and observe what’s happening. Then you let these new systems develop their own ways to self-repair.”

5 . I went with some colleagues for dinner in a very popular local restaurant. It was ________ business time and the restaurant was crowded.

As we were waiting for a table, we heard a crash when a cleaning boy________the floor with all the plates he was carrying. There was ________ and no one was saying or doing anything. In a flash I remembered my ________ many years ago. At one time, I ________ when I was on business. I had a high fever but luckily was taken care of by two ________. Then this was my chance to ________ it forward.

I had learned some first-aid lessons before, so I ran to the boy’s side________, turned him on his back and screamed for someone to ________ a hot drink. The boy soon opened his eyes,________ what had happened. And so I ________ him by saying it was OK. I held the warm drink to his mouth till he________ it. At that time the manager arrived, who was kind enough to look after the boy. By the time all this was over, we hadn’t________anything yet, and we decided to go home.

I slowly walked home, not hungry any more, feeling________for the opportunity to pay forward the _______ I had received many years ago.

6 . Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings.

The noise that affects sea creatures comes from a number of human activities. It is caused mainly by industrial underwater explosions, ocean drilling,and ship engines. Such noises are added to natural sounds. These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.

Decibels(分贝) measured in water are different from those measured on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibel level of one hundred and ninety-five would have the same effect.

Some scientists have proposed setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales.

A team of American and Canadian scientists discovered that louder noises can seriously injure some animals. The research team found that powerful underwater explosions were causing whales in the area to lose their hearing. This seriously affected the whales’ ability to exchange information and find their way. Some of the whales even died. The explosions had caused their ears to bleed and become infected.

Many researchers whose work depends on ocean sounds object to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important industrial and scientific research.

Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists suspect that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.

7 . Five years ago, French navy officer Chardon was listening to a radio program about the journey of the bar-tailed godwit (斑尾塍鹬) , a bird that flies 14,000 kilometers between New Zealand and Alaska. Chardon understood how dangerous the journey would be, as heavy storms frequently hit Pacific island communities. Yet, somehow, bar-tailed godwits routinely pass through the area uninjured. Chardon wondered whether learning how godwits navigate (导航) could help coastal communities avoid disasters. Could tracking birds help save lives?

This past January, a team began experiments designed to test Chardon’s idea. Researchers led by Jiguet equipped 56 birds of five species with cutting-edge animal tracking technology. The team were transported to remote islands in French Polynesia, where they attached tags (追踪器). These tags send the birds’ locations to the International Space Station, which sends the data back to scientists on Earth who can then follow the birds — all the while waiting to see how the birds respond to natural disasters.

The project is focusing on birds’ ability to hear infrasound, the low-frequency sound humans cannot hear. Researchers believe it’s the most likely signal birds would use to sense storms and tsunamis. In a 2014 study, scientists tracking golden-winged warblers in the central and southeastern US founded the birds flew up to 1,500 kilometers to escape from the outbreak of tornadoes that killed 35 people. This showed they’d heard the storm system in advance.

The team plan on tagging more birds across the Pacific to prepare for a potential tsunami. “I think if there’s one wave that spreads across islands, we should get data from different species at different locations,” says Jiguet. “That’d definitely show it’s worth continuing to tag birds and to develop local systems to better analyze this.”

Even if the attempt to develop a bird-based tsunami early warning system fails, the project will still help scientists protect birds. In that sense, the research will have already gained results by that time. Jiguet says their first season’s tracking data shows Hawaii is an important stepping stone for the birds they tagged — a useful clue to the protection of these species above rising seas.

8 . Brandon and Derek’s mother, Beth Lash, shared a Facebook video on Dec. 25, 2017. It captured the moment when Bandon _____ his card out loud. On Brandon Lash’s 24th birthday, his little brother, Derek, presented him with a rather large card filled with an even bigger ____.

“I have always respect you,” Brandon reads from the front of the card, _____ by this brother．

“I love spending time with you. I’m so _____ I have you for my brother. You have always been there for me, even though I get on your nerves sometimes. You will always have a piece of my heart,” Brandon continues, opening up the _____.

“And now you will have my kidney (肾), too. We are a _____ match.” Brandon reads, _______ the card to the floor and burst into ____.

Brandon ,who has kidney disease, receives _____ three times a week, and was told that he had been recommended for the transplant list. Unfortunately, his parents are not a match, but _____, his brother is.

“I can’t believe Derek would _____ so much for me,” Brandon tells the publication. “ He’s giving me a _____ to have a healthy life again. I still can’t believe it’s happening.”

“I _____ seeing him sick and knew something needed to be done to make him healthy again.” Derek adds. “Not only was it the _____ thing to do, but the only thing to do. He’s my brother. We didn’t know when he could be on the transplant list, but I knew I just wanted my ____ brother back.”

9 . About 1.4 billion people around the world do not get enough physical exercise. The world’s adult population is about 5.6 billion, so that is tantamount to about one-fourth of the world’s adult population.

Researchers looked at 358 population-based studies between 2001 and 2016. Those studies referred to nearly 2 million people in 168 countries.

Regina Guthold was the lead author of the report. She said the study also found a wide range of physical activity levels for countries around the world. “Inactivity ranges from as low as 6 per cent in Uganda and Mozambique to 67 per cent in Kuwait. Four countries have prevalence (普遍) of inactivity of over 50 per cent. That’s Kuwait, America Samoa, Saudi Arabia and Iraq,” she said.

The report shows the levels of physical inactivity are more than two times as high in wealthy countries as they are in countries where people have low incomes. In wealthier countries, people are more likely to spend time sitting in offices. They are also more likely to use computers and electronic devices for entertainment.

There are actually many things people can do for themselves. If you work in a high-rise office building, take the stairs instead of an elevator. Go for a walk during your lunch break. Take more breaks during the workday and move around. If your workplace offers a gym or exercise classes, make sure to use them. At home, take walks with your family or friends after dinner.

10 . “Don’t tell anyone”. We hear these words when someone tells a secret to us. But it can be hard to keep a secret. We often tend to “spill the beans”, even if we regret it later.

According to Asim Shah, professor in the Menninger Department of Psychiatry and Behavioral Sciences at Baylor College of Medicine, US, keeping a secret may well “become a burden”. This is because people often have an “obsessive and anxious urge to share it with someone”.

An earlier study, led by Anita E. Kelly, a scientist at the University of Notre Dame, US, suggested that keeping a secret could cause stress. People entrusted (受委托的) with secrets can suffer from depression, anxiety, and body aches, reported the Daily Mail.

But with secrets so often getting out, why do people share them at all?Shah explained that people often feel that it will help them keep a person as a friend. Another reason people share secrets is guilt over keeping it from someone close to them. A sense of distrust can develop when people who are close do not share it with each other. “Keeping or sharing secrets often puts people in a position of either gaining or losing the trust of someone,” according to Shah.

He added that talkative people could let secrets slip out (泄露). But this doesn’t mean that it is a good idea only to share secrets with quiet people. A quiet person may be someone who keeps everything inside. To tell such a person a secret may cause them stress, and make them talk about the secret.

Shah said that to judge whether to tell someone a secret, you’d better put yourself in their position. Think about how you would feel to be told that you mustn’t give the information away. Shah also recommended that if you accidentally give up someone’s secret you should come clean about it. Let the person know that their secret isn’t so secret anymore.