For many years, the Future City Competition has brought together young people to create visionary(幻想的) designs,     1     (require) skill and imagination. This year’s theme, “The Age-Friendly City,” invited students to design small cities,     2     would enable older people to live     3     (independent).

The competition, which     4     (encourage) students to hone (磨炼) their engineering skills while working to create a better world, is open to kids in    5     (grade) six through eight. After more than 44, 000 students participated in regional competitions, finalists    6     (choose) for the top competition.

The grand prize went to “Halona,” a city of the future    7     (create) by students from Edlin School in Reston, Virginia. The team researched and developed their model city     8     the help of teacher Vasantha Ayala and volunteer mentor ( 导师) Nandhini Kuntipuram. For their grand prize,     9     Edlin students won $7, 500 for their school’s STEM (science, technology, engineering, and math) program.

Tom Chmielenski, a computer software engineer, served as a judge. “It’s very nice as an engineer to see young people have these futuristic ideas,” he said. “We can’t wait     10     (see) what the future holds.”

8 . Exercise is an important part of staying healthy — both physically and mentally. Studies show that it can help strengthen the body’s natural defenses against disease.     1     For many people, it is also a part of their daily routine, making them feel better about themselves.

    2     However, because of the current restrictions and social distancing, some ways of exercising have changed or are simply gone. So, people are changing how they exercise during this coronavirus pandemic (新冠疫情).

Those who only exercise indoors might now consider moving their exercise routine outdoors.

    3     “Simply walk outside in nature,” Khabbaza said. “People can use this as an opportunity to exercise in other ways.” But in areas with stay-at-home orders or enforced social distancing, exercising outside may not be as simple as it sounds.     4    

Gyms, recreation centers and exercise studios are not open. So, some people are turning online to exercise. The physical fitness industry is also moving to online training. The Associated Press news agency contacted industry representatives and other people. Beth Berglin is the director of a charitable group in Miami, Florida. Before the pandemic, her exercise routine involved going to actual camp-style classes four mornings a week.     5     Instead, she is staying active through online classes.

9 . Small amounts of exercise could have a great effect on happiness.

According to a new review of research about good moods and physical activities, people who work out even once a week or for as little as 10 minutes a day tend to be more cheerful than those who never exercise. And any type of exercise may be helpful.

A number of past studies have noted that physically active people have much lower risks of developing depression and anxiety than people who rarely move.

Fewer past studies explored links between physical activity and upbeat emotions, especially in people who already were psychologically healthy, and those studies often looked at a single age group or type of exercise.

So for the new review, the Michigan researchers found, exercise was strongly linked to happiness. The type of exercise did not seem to matter. Some happy people walked or jogged. Others practiced yoga-style posing and stretching. And the amount of exercise needed to influence happiness was slight. In several studies, people who worked out only once or twice a week said they felt much happier than those who never exercised. In other studies, 10 minutes a day of physical activity was linked with happy moods.

But because most of the studies in this review were observational, it is not possible yet to establish whether exercise directly causes changes in happiness or if the two just happen to occur together often. In that case, exercise would not have helped to make people happy; rather, their happiness would have helped to make them exercisers