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.

Ever since I was a girl, I have been pushing my limits,    1    (live) my life to extreme and putting extra efforts to set myself apart    2    my competitors. Some of my friends and family members are     3     (concern) about me and my health,    4     could have made me angry and defensive. But deep down, I know parts of    5     they say are true.

To be honest, I have fears as     6    professional athlete on a day-to-day basis, thinking about not being the top. I am always tired. And I also ruin family occasions for my training     7    (frequent)

However, it boils down to this：if my goal is to be the best, I had better be committed to my sport even if it means     8    (get) injured. Doing what we do as athletes makes us outstanding. Call it unhealthy or abnormal if you want,     9    these are not the words for anyone who    10    (strive) for greatness.

On the west bank of the Mississippi, there is an unusual house with a white fence, preserved (保存)     1    a museum in memory of its former owner — Mark Twain. It is said that many of the     2     (character) and stories from his novels     3     (base) on real-life experiences that he had there as a boy. Mark Twain’s family moved to this house in Hannibal, Missouri when he was 8 years old. However, the family was so poor that they had to move out of the house for a while,    4     (live) above a local drug-store in exchange for his mother’s     5     (serve) as a cook. They managed     6     (move) back long after his father’s death, in 1847. Ten years     7     (late) at the age of 22, Mark Twain started to work as a journalist on a riverboat,    8    he wrote many famous books. These books include The Adventures of Huckleberry Finn,    9    anti-racist story that wins its readers’ heart but is     10     (fierce) criticized for using racial terms.

Besides the T-shirts, toys and trophies at the Qatar World Cup, which opened on Sunday, less visible Chinese     1     (element) include irrigation and grass maintenance technology from Ningxia University.

    2     the spray and drip watering methods, the new irrigation technology employed at this year’s World Cup soccer pitch uses wind and solar power     3     (lift) and transfer the water underground and the internet of things to realize smart control of watering.

The more precise technology—developed by Ningxia University in the Ningxia Hui autonomous region over the past decade—    4     (reduce) the water waste that accompanies     5     (tradition) irrigation.

In August 2020, the university reached     6     cooperation agreement with the Qatari government on the technology,     7     has more than 30 patents in China.

Under the agreement, researchers from the university would cooperate with Qatar on projects     8     (cover) food, environmental protection and water-efficient afforestation (人工造林) and agriculture.

In recent years, Ningxia     9     (expand) its cooperation with Arab countries in water-saving technology. For instance, the university has established two research labs that     10     (dedicate) to water-saving irrigation technology in Oman and Egypt.

Albert Einstein made     1     (number) contributions to the world, the most well-known     2     (be) the general theory of relativity and the famous formula E=mc2. Einstein once took a job as a clerk in the Swiss patent office. While     3     (work) there, out of a strong passion    4    knowledge, he continued to study, earning a doctorate in physics in 1905. Einstein had a thick moustache and long white hair which sometimes stood on end as though he     5     (receive) an electric shock. Although he was a genius, he sometimes forgot things, like his friends’ birthdays. But despite his peculiarities, he was loved by his friends and neighbours.

In the article, “Passenger Dies When Car Crashes in Driverless Mode”, various people said that some     6     (advance) in technology were unnecessary and could even be dangerous.     7     , we should cease accepting technology just because it is new. On the one hand, some people advocate a simple life with an     8     (emphasize) on hard work, family, and community. On the other hand, many people get benefits from new technologies.     9     (person), I have benefited quite a lot from new technologies. I will always look on the positive side of change and accept it rather than     10     (resistance) it.

Most polar bears could die out by the end of the century due to global warming,     1     (scientist) say. According to a study, most polar bear populations will be dropping markedly by 2080. The cause is melting (融化) sea ice. Polar bears feed     2     (main) on seals on the ice. Without ice, the bears have to walk to faraway places and spend more and more time away from     3     (they) main food source. That means the animals could die.

Lack of food leads to another problem: Mother bears may not be fat enough to produce milk for their babies. Some bears could stop     4     (have) babies, which results     5     a rapid decline (减少) in numbers.

Arctic sea ice usually melts in spring and summer, and then grows in winter. But now, the ice is taking     6     (long) to grow back. Weather statistics say the Arctic is warming twice as fast as the rest of the planet. Ice in the region     7     (drop) by 13% every 10 years since the 1970s.

But the study also notes that it is still possible     8     (slow) Arctic melting. The world can cut the burning of coal, oil, etc. and lower the greenhouse gas emissions (排放)     9     bring about climate change. It would have to be a big drop to make     10     difference.