As English learners, we have the alphabet clearly in our mind, in order, from a very young age. You can say the ABCs    1    rapid speed and some people can even say them backwards without     2    (think)about it. We certainly can't imagine the alphabet being in any other order. but how did the order we know today come to be?

There’s    3    (real) not an easy answer. No one woke up and decided to put the     4    (letter )in that order, the alphabet     5    (evolve)slowly over a long period of time to become     6    it is today. Our alphabet can date back to ancient Egypt. This first alphabet     7    (improve)by the Phoenicians around1000 BC,    8    (early)than the Greeks by 200 years, and we have them to thank for vowels (元音 ) From Greece, our alphabet traveled to Rome, and the Romans turned     9     into the“modern”alphabet, with letters we recognize today.

So why that order? While we don’t know for sure. some scholars assumed that the order came from memory cells in our brains meant     10    (help)people remember it-some kind of sentence where each letter became a full word, like the technique you used in school to remember the order of the planets.

People have all turned to sad music to make     1     (they) feel better at some point in their lives, but why does the music with double sadness help drag people out of low spirits?

A new study throws light on what’s going on inside people’s brains when they match their music to their feelings, and it looks as if sad music can be enjoyable, rather than     2     (simple) depressing. Music of this sort can arouse positive memories in people’s life, thus     3     (lift) their mood.

Psychologist Adrian North from Curtin University in Australia says     4     exist two groups of possible explanations for why people enjoy listening     5     sad music—one from social psychology (心理学), and the other from cognitive neuroscience (神经学).

In terms of social psychology, one idea about this is that people will feel     6     (good) about themselves if they focus on someone who’s doing even worse. Everything’s going to be okay, because this person is having     7     even worse day than they are.

Another idea from social psychology is that people like to listen to the very music     8     shows their present life circumstances, because this kind of music makes them feel they are understood. With their emotions     9     (share), they definitely get a certain amount of comfort.

So sad music does cheer people up, and it     10     (work) far better than happy music, in most cases.

Moon Day     1     (celebrate) on July 20 every year. Moon Day     2     (mark) the first human landing on the moon that     3    (occur) on July 20, 1969. Ever since 1969, Moon Day     4    (celebrate) in the US to mark one of the greatest achievements in human history.

One way to celebrate Moon Day is to make something about the moon, like cutting paper moons. You can also bake cookies and cut them in the shape of the moon. Also consider learning some facts about the moon on this occasion. Exploring the moon on Google Moon     5    (be) a great idea to get familiar with our natural satellite.

It is especially important that we celebrate Moon Day with children. In this way, children can learn about what     6    (happen) on July 20, 1969, and     7    (understand) the importance of this event in the future.

China's icebreaker Xue Long will set sail from Shanghai to the Antarctic. Its captain Zhu Bing said that the icebreaker would first travel to the to－be－built new station before     1    (make) a short stop at Zhongshan station. One of its main tasks is to build another research station in the Antarctic.

Once     2    (complete), the new station would be the country's third year－round station in the Antarctic and the first to be lying     3     the border of the Pacific Ocean.     4     other two stations, the Great Wall Station and the Zhongshan Station,     5    (build) in the 1980s. “This time around, we will build a 206－square－meter temporary base, which includes rooms for workers and a platform for large engineering     6    (machine), to improve future construction work，” said Zhang Tijun of the Polar Research Institute of China,     7     is the assistant leader of the expedition.

Sun Bo, the deputy director of the institute, was     8    (confidence) to say that the construction of the station, which will     9    (certain) meet international criteria for environmental     10    (protect), will be finished as early as 2022.

Now that summer is finally here, families are preparing for     1     they expect to be a great vacation away from the daily routines. While this once     2     (mean) getting outside and enjoying life, more people are remaining indoors thanks to smart phones and many other modern conveniences. Anyway,     3     is time to get outside to experience summer together with fun family activities. For example, hit the bike paths. Statistics consistently show that half of     4     (child) prefer riding bicycles to playing on computers or smart phones.    5     (consider) the fact that kids are being constantly introduced to digital technology at younger ages, this statistic may seem a little surprising.     6     (fortunate), this doesn’t change the fact that bicycle riding is a fun, healthy, and outdoor activity     7     can be enjoyed within the whole family. Another great family activity getting everyone outside and to enjoy nature is gardening. In addition     8     burning hundreds of calories without traditional exercise, it gives both kids and adults a sense of     9     (achieve) when their hard work pays off. After enjoying some of these summer activities, you might just find your family eager     10     (stay) in the great outdoors.