A recent survey has found that many people suffer from sleep problems. Some are     1     (able) to fall asleep, some wake up in the middle of the night, and others     2    (simple) do not get enough sleep. One of the reasons why people fail to get a good night’s sleep     3     (be) pressure from school or work. Noise pollution and light pollution in big cities may also contribute     4     sleep problems. In     5     short term, people with sleep problems often feel tired and have trouble concentrating. In the long term, they may be at increased risk of having a poor memory, being overweight and     6     (suffer) a heart attack. Sleep problems are especially dangerous for     7     (teenager). They are still growing and night is the time when     8     (they) bodies grow faster. Teenagers     9     do not sleep well may experience situations where body development slows down, and their health suffers.

So, if you have trouble getting a good night’s sleep, it might be time     10     (make) some changes in your lifestyle.

Tea is a simple drink. And it is central to the lives of millions of people worldwide.

There are six major types of tea in China-green tea, black tea, Oolong tea, dark tea, white tea, and reprocessed tea, distinguished     1    (main) by different methods of production.

China,    2     (recognize) as the homeland of tea, is a leading producer and consumer, and the     3    (discover) and the usage of tea have a history of 4, 000 to 5, 000 years. Drinking tea first    4    (start) to become popular in the Tang and Song Dynasties.

The origin of tea is lost among history and legend.    5     can be roughly confirmed is that tea originated in southwest China. In Yunnan and elsewhere, some wild tea trees that     6    (be) over 1, 000 years old still exist.

Many traditional Chinese families drink tea after dinner or when     7    (greet) visitors. This is not only a     8    (health) habit but also reflects rich culture and history. Chinese people can chat with a friend or enjoy themselves for a whole afternoon     9    a pot of good tea.

It was in the Tang Dynasty that teahouses came into being, and in some big cities then, there were also tea shops,    10     stored large quantities of tea leaves and prepared tea for their customers.

There comes a time when the old must give way to the new. Finding and     1     (keep) the right balance between progress and the protection of cultural sites can be     2     big challenge.

In the 1950s, the Egyptian government wanted to build a new dam across the Nile     3     (control) floods, produce electricity and supply water to more farmers, but the proposal led to     4     (protest).

After listening to the experts’ opinion, the government turned to the United Nations for help. Then a committee     5     (establish) to limit damage to the Egyptian buildings and prevent the loss of cultural relics.     6     (final), a document was signed, and the work     7     (begin) in 1960.

    8     the project ended in 1980, it was considered a great success. Not only had the countries found a path     9     the future that did not run over the relics of the past, but they had also learnt that it was possible for countries to work together to build a better tomorrow. The spirit of the Aswan Dam project is still alive today.   If a problem seems too difficult for a single nation, the     10     (globe) community can sometimes provide a solution.

It is quite normal     1     (struggle) with parent-child tensions, which may be caused by your physical changes in your teenage     2     (year). You may feel     3     (concern) about your changes, such as changing voice, weight problems or spots. Moreover, it is hard to balance your developing mental needs. You have both a new desire for     4     (independent) and a continued need for your parents’ love and support. Unfortunately, your parents do not always agree with you, which makes you feel     5     (happy).

    6     sometimes it may seem difficult to get along as a family, you can take action to improve the situation. The key to     7     (keep) the peace is regular and honest communication. Only in this way can you feel calm and     8     (relax).

The good news is     9     this stormy period will not last long. Everything will turn out right in the end, and the changes and challenges of your teenage years will prepare you     10     adulthood.

With the development of modern technology, people can stay     1     (connect) with their families and friends easily, however far apart they are from each other. WeChat is one of the most     2     (frequent) used means of communication in China. It is reported that the number of the WeChat users     3     (reach) over 1.1 billion so far.

Once joining the WeChat, people can find more and more people start to add them     4     fiends. They don’t have to consider time     5     (zone) when communicating. Another reason why it is so popular is that it costs nothing. It’s also very convenient for people to immediately update     6     they are doing by WeChat.

However, addiction to WeChat will rob people of the time that should otherwise     7     (spend) on something more important. And the many so-called friends on it are not really friends at all, who simply want     8     (put) ads or sell items on Moments. Besides, people on the WeChat are more likely to compare     9     (they) with others, which will make them feel bad when finding some people seem to be     10     (success).

We know that being a teenager is sometimes full of     1     (challenge). To help you along the journey to adulthood, we have designed TeenHealthWeb     2     has many articles about teenagers’ physical and mental health. You can look through these articles to find     3     (advise) on your problem. If it hasn’t been addressed, you can visit the “teen health” forum on our website instead. We can     4     (proud) say this forum is the heart of our website. Users     5     (encourage) to post their problems, and they will get useful tips from our health experts and other forum users. Before     6     (write) your post, however, you’d better take a look     7     other users’ posts first.     8     is likely that the matter has already been discussed on our forum. If your problem is a new one, write a post about it. Our health experts will be     9     (delight) to offer you help and tell you how     10     (improve) your situation.