Children need a healthy,     1    (balance) diet that gives them enough energy to grow and develop. This means that it's necessary for them    2    (take) in more energy than they use and this extra energy forms new tissues as they grow. However, if children regularly take in too much energy, this is stored as fat and they will put    3    weight.

Childhood obesity is one of the most serious public health    4    (challenge) of the 21st century. The problem is global and is    5    (steady) affecting many low-income and middle-income countries, particularly in urban settings. The trend has increased at an    6    (alarm) rate. Globally, the number of overweight children under the age of five    7    (be)estimated to be over 42 million. Close to 35 million of these are living in developing countries.

The causes of obesity are complex and include genetic, biological, behavioral and cultural factors. Obesity occurs when a person eats    8    (many) calories than the body burns up. If one parent is obese, there is a 50 percent chance    9     　their children will also be obese. However, when both parents are obese, their children have    10    80 percent chance of being obese. Less than 1 percent of all obesity is caused by physical problems.

Every year around Valentine’s Day, men begin to worry about what     1     (present) to buy and women     2     (fill) with hope and expectation. Or the other way around. In China, more couples get married on that very day,     3     (add) romance to their promises. But for many, love is neither the matter-of-course choice     4     the preferred one. More young, working urban residents are delaying or even choosing not to     5     (active) seek their partners despite the social pressure from the older generations to do so.

Over the years, China’s divorce rate has exceeded (超过) that of marriage. According to the statistics from the Ministry of Civil Affairs, 10 million couples registered for marriage in 2017 fell by 7%     6     (compare) with the same period last year, while 43.7 million couples divorced, 5.2% more than the same period last year.

There is also a growing trend towards people marrying later: since 2013, the number of couples aged 25 to 29 has been greater than     7     of younger couples. In the     8     (late) survey on professional attitudes towards love and marriage, more than half of the investigated in Yangzhou,     9     second-level city on the East coast, were satisfied     10     their marriage after 35.

Did you grow up in one culture, your parents came from another, and you are now living in a     1     (total) different country? If so, then you are a third-culture kid.

Yet many       5     (difficulty) may arise from this phenomenon. Third-culture kids may not be able to adapt themselves completely     6     their new surroundings. Also, they often find it hard     7     (develop) new friendship. Additionally, for a third-culture kid, it is often easier to move to a new country     8     to return to his homeland. For example, after living in Australia for many years, Louis finally returned to the country     9     she was born. She didn’t know anything about current TV shows     10     fashion trends. And she didn’t share the same values as other teens of her age.