1 . By now we all know the importance of drinking enough water throughout the day, but there is such a thing as too much. Earlier this summer, a 35-year-old Indiana woman, died from water toxicity(毒性作用) after drinking too much water in a short period of time, according to a local news report.

While drinking enough water is important, overdoing it can lead to low levels of sodium(钠) in the blood, which can be life-threatening, according to Julia Zumpano, an expert at Cleveland Clinic’s Center for Human Nutrition.

Exactly how much is enough for our body depends on a variety of factors, including our weight, age, location and overall health. People in poor health, or active people such as athletes, are at risk of water toxicity, as they tend to drink large amounts of water and lose sodium through their sweat. So are women and children because of their smaller body size.

While the gold standard for many years has been eight glasses of 8 ounces(盎司) of water per day, the National Academy of Medicine suggests enough water intake is about 125 ounces for men and about 91 ounces for women. And it recommends not drinking more than 48 ounces of water per hour. This includes total water from fruits, vegetables and other drinks besides water.

If you struggle with getting enough water per day, you can try water bottles to help track your water intake. Eating fruits and vegetables can also increase our water intake. You could experiment with adding flavor to improve the taste of your water.

“Most people had better keep drinking water throughout the day, but larger amounts may be needed in the heat for an extended period of time or during exercise. If you are thirsty water—listen to your body. But don’t overdo it,” says Zumpano.

Ebru is a Turkish art from Central Asia     1     began at the beginning of the 16^th century. It is thought that Ebru art first     2     (appear) in China but became popular in Turkiye during Ottoman times.

It is     3     art form where you paint directly on the surface of water in a shallow tray (托盘). Once you’ve finished your design, you need to put a sheet of paper on the surface     4     (change) the design from the water onto the paper. Historically, paper marbling (大理石纹饰) was the only form, but today, patterns can     5     (print) to all sorts of things such as leather, glass, cloth, furniture, book covers and notebooks.

The process sounds simple, and     6     (actual) it is, but the results are hard to master. An Ebru     7     (art) will paint for decades before he or she is recognized as true master of the art.

Back in the Ottoman Empire, the Ottomans used Ebru to decorate (装饰) the spines of books with     8     (colour) designs. Not only was this decorative, it was also used as a type of code. If the pattern on the spine was     9     (break), then you’d know some pages were missing from the book and someone had intercepted the message.     10     clever that is!

8 . Five years ago, I got an email from a well-known professor in my field in March. He invited me to _________ for a position in his lab. Things went well and all I needed to do was finish up my thesis (毕业论文) and I decided to _________ it in the following months.

One night, my mother came up to my room, asking softly, “Have you _________ your thesis yet?” “Not yet, Mom,” I _________, even too busy to look up at her. Then she mentioned that she had some _________ symptoms (症状) in her body that had never been seen before. She wanted to say something more, but my academic (学业的) _________ made me hardly take her words to heart.

However, two months later, the doctor announced my mother might _________ for less than a year _________ cancer (癌症). It was then that I _________ that things became more serious than I had imagined. Before it was too late, I was __________ to stop my thesis and be there with my mother for her rest life. __________, my mother failed in the battle and passed away at the end of the year. The next July, I finished my scientific thesis and got the __________ from the lab.

When looking back today, I feel __________ for losing precious time with my mother. The __________ of my mother gave me a new way to think about life: If your loved ones need you, be there for them. Science will be waiting when you __________.

9 . Friendship plays an important role in our life. If you and your friends are in conflict (冲突) and your friendship is coming to an end, it’s time to work through hurt feelings and misunderstandings.     1    .

Reflect and write down the good. Before you face a difficult conversation with a friend, stop and reflect (反思).     2    . At that time this friendship brought you joy or excitement. Use that memory as an inspiration to write down things you thank for about a friend. Beginning the communication repair from a place of gratitude and positive sides is going to make the conversation a lot more meaningful.

    3    . If repair efforts have not worked in your usual ways，try another way. Send more postcards, write more letters or send someone a book you think they would enjoy. In your letter, include why you think the relationship feels embarrassed—and why you want to repair it. You may realize your friend is going through something. You’ll begin the all-important practice of listening, before you even sit down to talk to each other.

Give it time and try again. The expert noted that friendships may require time to settle back into normal after the conflicts. People differ in how they deal with conflicts.     4    . That lasting uncomfortable feelings may require further attention.

Sometimes a friendship suffers due to a miscommunication. The experts encourage people not to let a single problem break up a friendship. Don’t give up a friendship because one conflict has appeared.     5    .

10 . An international design competition was held in 1955 for an art center to be built. There were 233 entries received from many countries. Danish architect Jorn Utzon won the competition with his unique design of shells that looked like sails on a boat.

The construction began on March 2, 1959 and was expected to be accomplished within 4 years. However, they quickly ran into trouble. The ground was not suitable to hold the weight of the building and huge concrete foundations (混凝土地基) had to be built. Mr Utzon had also made mistakes about how many columns (柱) would be needed to support the roof, thus making the concrete shells at the risk of falling down.

Mr Utzon figured out a new way to disperse the weight of the concrete by making each shell out of a part of a perfect globe. The 14 shells look like a single piece of concrete, but they are actually built across frames (框架) of concrete to hold them in place. They weigh as much as 15 tons each. The highest roof point of the building is 67 m above sea level — the same as a 22-storey high building.

This major correction saved the project but added one decade to the building time. The building consists mainly of two main halls, a number of smaller theaters, performance halls and other additional facilities. Both main halls are housed in relatively large sail-shaped structures, and the smaller performance halls are housed at the ground floor. In particular, the grand organ (风琴) in the concert hall is one of the world’s largest organs containing over 10,000 pipes.

The Sydney Opera House is a great success in the history of architecture. It is not only a world-famous performing arts center and the landmark of Sydney, but also recognized as one of the seven wonders of the world of the 20th century. In 2007, the Sydney Opera House was added to UNESCO’s World Heritage List.