It was the day of the big cross-country run. Students from seven different primary schools in and around the small town were warming up and walking the route(路线)through thick evergreen forest.

I looked around and finally spotted David, who was standing by himself off to the side by a fence. He was small for ten years old. His usual big toothy smile was absent today. I walked over and asked him why he wasn’t with the other children. He hesitated and then said he had decided not to run.

What was wrong? He had worked so hard for this event!

I quickly searched the crowd for the school’s coach and asked him what had happened. “I was afraid that kids from other schools would laugh at him,” he explained uncomfortably. “I gave him the choice to run or not, and let him decide.”

I bit back my frustration(懊恼). I knew the coach meant well—he thought he was doing the right thing. After making sure that David could run if he wanted, I turned to find him coming towards me, his small body rocking from side to side as he swung his feet forward.

David had a brain disease which prevented him from walking or running like other children, but at school his classmates thought of him as a regular kid. He always participated to the best of his ability in whatever they were doing. That was why none of the children thought it unusual that David had decided to join the cross-country team. It just took him longer—that’s all. David had not missed a single practice, and although he always finished his run long after the other children, he did always finish. As a special education teacher at the school, I was familiar with the challenges David faced and was proud of his strong determination.

4 . My husband, our children and I have had wonderful camping experiences over the past ten years.

Some of our _______ are funny, especially from the early years when our children were little. Once, we _______ along Chalk Creek. I was _______ that our 15-month-old boy would fall into the creek (小溪). I tied a rope around his waist to keep him near to our spot. That lasted about ten minutes. He was _______, and his crying let the whole campground know it. So _______ tying him up, I just kept a close eye on him. It _______ — he didn’t end up in the creek. My three-year-old, however, did.

Another time, we rented a boat in Vallecito Lake. The sky was clear when we _______, but storms move in fast in the mountains, and this one quickly _______ our peaceful morning trip. The _______ picked up and thunder rolled. My husband stopped fishing to ____________ the motor. Nothing. He tried again. No ____________. We were stuck in the middle of the lake with a dead motor. As we all sat there ____________, a fisherman pulled up, threw us a rope and towed (拖) us back. We were ____________.

Now, every year when my husband pulls our camper out of the garage, we are filled with a sense of ____________, wondering what camping fun and ____________ we will experience next.

6 . Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.

Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact (接触) with the ground at all times. It’s this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.

Like running, race walking is physically demanding, she says, According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories(卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.

However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.

As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.

The Meredith family lived in a small community. As the economy was in decline, some people in the town had lost their jobs. Many of their families were struggling to make ends meet. People were trying to help each other meet the challenges.

Mrs. Meredith was a most kind and thoughtful woman. She spent a great deal of time visiting the poor. She knew they had problems, and they needed all kinds of help. When she had time, she would bring food and medicine to them.

One morning she told her children about a family she had visited the day before. There was a man sick in bed, his wife, who took care of him and could not go out to work, and their little boy. The little boy -his name was Bernard-had interested her very much.

“I wish you could see him,” she said to her own children, John, Harry, and Clara. “He is such a help to his mother. He wants very much to earn some money, but I don't see what he can do.”

After their mother left the room, the children sat thinking about Bernard. “I wish we could help him to earn money,” said Clara. “His family is suffering so much.”

“So do I,” said Harry. “We really should do something to assist them.”

For some moments, John said nothing, but, suddenly, he sprang to his feet and cried, “I have a great idea! I have a solution that we can all help accomplish(完成).”

The other children also jumped up all attention. When John had an idea, it was sure to be a good one. “I tell you what we can do,” said John. “You know that big box of corn Uncle John sent us? Well, we can make popcorn(爆米花), and put it into paper bags, and Bernard can take it around to the houses and sell it.”

8 . Is Fresh Air Really Good for You?

We all grew up hearing people tell us to “go out and get some fresh air.”     1     According to recent studies, the answer is a big YES, if the air quality in your camping area is good.

    2     If the air you’re breathing is clean—which it would be if you’re away from the smog of cities—then the air is filled with life-giving, energizing oxygen. If you exercise out of doors, your body will learn to breathe more deeply, allowing even more oxygen to get to your muscles(肌肉) and your brain.

Recently, people have begun studying the connection between the natural world and healing(治愈).     3     In these places patients can go to be near nature during their recovery. It turns out that just looking at green, growing things can reduce stress, lower blood pressure, and put people into a better mood(情绪).Greenery is good for us. Hospital patients who see tree branches out their window are likely to recover at a faster rate than patients who see buildings or sky instead.     4     It gives us a great feeling of peace.

    5    While the sun’s rays can age and harm our skin, they also give us beneficial Vitamin D   . To make sure you get enough Vitamin D—but still protect your skin—put on sunscreen right as you head outside. It takes sunscreen about fifteen minutes to start working, and that’s plenty of time for your skin to absorb a day’s worth of Vitamin D   .

According to a review of evidence in a medical journal, runners live three years     1    (long) than non-runners. You don't have to run fast or for long    2    (see)the benefit. You may drink, smoke, be overweight and still reduce your risk of     3     (die) early by running. While running regularly can't make you live forever, the review says it     4     (be) more effective at lengthening life    5     walking, cycling or swimming. Two of the authors of the review also made a study published in 2014    6    showed a mere five to 10 minutes A day of running reduced the risk of heart disease and early deaths from all     7    (cause).

The best exercise is one that you enjoy and will do. But otherwise…   it's probably running. To avoid knee pain, you can run on soft surfaces, do exercises to    8    (strength)your leg muscles(肌肉),avoid hills and get good running shoes. Running is cheap, easy and it's always    9    (energy).If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give    10    a try.