In 2010, researchers at Princeton University decided     1     (dig) into the question of whether money can buy happiness. The researchers surveyed over 450, 000 people to look for a connection between each person’s emotional wellbeing (健康)     2     their level of income.

The researchers found that money does increase one’s emotional wellbeing, but only up to a certain point. Up to $75, 000 per year, more money leads to more happiness. The lower someone’s income below $75, 000, the     3     (bad) their emotional wellbeing. But making more     4     $75,000 per year had no additional impact     5     happiness.

This number actually isn’t all that surprising. Based on data from GOBankingRates, the median ( 中间的) amount you’d need to make to live     6     (comfortable) in the United States is $67, 690. So someone making $75,000 per year would be able to pay all their bills, while also having some leftover (剩余) to enjoy.

There are plenty of good points on both     7     (side) of the argument of whether money can buy happiness. Sure, the money     8     (it) doesn’t make you happy. And buying more things likely won’t either.

But money is a tool. And when it     9     (use) properly, money helps you to reach financial goals that make you happier. For some, that happiness looks like more time with the family. For others, it’s simply the stress relief that comes with knowing you don’t have to worry about     10     (be) late on your bills. It’s not the money that makes you happy — it’s how you use it.

    1    (volunteer) is very important. The benefits of volunteering extend(延伸) far beyond the reach of the community and the individual     2    is being directly helped. There are many studies     3    (indicate) that volunteering is     4    (physical) and mentally beneficial to volunteers’ well-being. The    5    (benefit) are significant even if you have just started to explore the world of volunteering.

Choose     6    agency (like the Aging & Disability Resource Center of Central Wisconsin) that is in line with     7    (you) interests. Call them and explain what you     8    (look) for now, including your interests, skills and time. After thinking about what you can do, give some thought to how much. Do you want a brief, weekend long project? Do you want to give two hours a week or even an hour or two every day? You also need to give some thought to why you want to volunteer. Most people want to help someone, but since there are great rewards     9    volunteering, you need to really think about the why.

Volunteering can be extremely     10    (reward). Everyone has a different reward and reason to continue.

Chinese teenage sensation(引起轰动的人) Quan Hongchan produced three perfect 10-point dives and won the Olympic women’s 10 meters platform gold medal on Thursday. Her performance illustrated China’s     1     (strong) in the sport.

China     2     (claim) gold in all of the women’s diving events since the Beijing Olympics in 2008. Quan, 14 years old, is the     3     (young) Chinese athlete in Tokyo. She admitted that she didn’t expect to win, as the Tokyo Olympics is her first time to compete overseas.

Quan made     4     (limit) splashes(飞溅) when diving into the pool. As     5     result, she made three perfect 10-point dives. When asked how she managed to do it, she said the team director just asked her to sleep early before the test.   “My parents told me not to be nervous.     6     doesn’t matter whether I get a medal or not. Just be myself. Those words really helped me,” Quan added, saying she planned to eat latiao, a popular Chinese street snack, to celebrate the win.

Thursday’s result means Quan became the second youngest woman     7     (win) a gold medal in the women’s 10 meters platform. Her predecessor(前辈) Fu Mingxia gained success     8     the age of 13 at the Barcelona Games in 1992. Her performance was met with cheers from onlookers(观众),     9     (include) Shi Tingmao and Xie Siyi. They are athletes     10     won their own diving golds in Tokyo.

World leaders at the 5th meeting of the United Nations Environment Assembly (UNEA) agreed that by 2024, they would create and sign a new treaty on plastics. The new treaty would create international laws     1     could help bring plastic waste under control.

Because plastic is useful for so many purposes, it has become a part of nearly all areas of our lives. It’s hard to look anywhere without finding dozens of     2     (object) made of plastic.

The United Nations Environment Program (UNEP) reports that     3     (current) 400 million tons of plastic is produced every year. By 2040, that number is predicted to double. And even though there’s a lot of talk about recycling, only 9% of all the plastic ever     4     ( produce) has been recycled.

Plastic gives off dangerous gases when it’s made and also when it’s burned or buried in the ground. Scientists say plastics are responsible     5     4.5% of the world’s greenhouse gases — the gases that are driving the climate crisis.

Plastic doesn’t “decompose (腐烂)” like natural materials. Instead, it just breaks into smaller and smaller pieces. And as the plastics     6     (fill) our world break down, they create     7     new problem — microplastics.

Microplastics are so tiny that     8     (they) existence is usually ignored. In the past few years, microplastics     9     (find) almost everywhere, from the North pole to Antarctica, from the top of the Earth’s     10     (high) mountain to the deepest point in the sea. They’ve even appeared in the bodies of animals including humans.

As one of the most well-known tourist     1     (attraction) in China's Guangxi Zhuang Autonomous Region, the beautiful Li River was polluted. Water in the river suffered     2     (great) as tourists threw rubbish into the river. Besides, people on the boats     3     (pour) the oil from the kitchens into the water. Also chemicals used to increase crop production resulted     4     poor water quality, causing a decrease in the number of fish species. Luckily, local officials were concerned about the issue and began to take steps     5     (address) it. By     6     (construct) waste water treatment facilities and closing or moving polluting enterprises,     7     water quality was improved. Not only were new rules introduced to preserve the river,     8     the local authorities also used the media to spread environmental     9     (aware) and encourage greater use of clean energy. With these measures, China's waterways are heading towards a clean and     10     (sustain) future.