Something significant is happening to the world population-it is aging. The median(中位数的)age of an American in 1950    1    (be)30-today it is 41 and is expected    2    (increase)to 42 by 2050. For Japan, the    3    (number)are more striking-22 in 1950, 46 today and 53 in 2050. In 2015, one in 12 people around the world were over 65；by 2050, it will be one in six.

This aging of the population is driven    4    two factors. The first is declining birthrates, which means old generations are large    5    (compare)to younger generations, and so, on average, the population becomes    6    (old)than before. This is    7    (particular)true in the US. The second reason is that people are living longer. A child born in the US today has    8    very realistic chance of living beyond 100 and needs to plan accordingly.

People tend to focus on the first factor. However, greater attention should    9    (place)on longevity(长寿). It isn't just that people are, on average, living longer. It's also that they are on average healthier    10    more productive for longer. Therefore, they can work for longer, consume more and in general be a boost to the economy.

Few people I know seem to have much desire or time to cook. Making Chinese     1    (dish) is seen as especially troublesome. Many westerners     2     come to China cook much less than in their own countries once they realize how cheap     3     can be to eat out. I still remember     4     (visit) a friend who’d lived here for five years and I     5    (shock) when I learnt she hadn’t cooked once in all that time.

While regularly eating out seems to     6    (become) common for many young people in recent years, it’s not without a cost. The obvious one is money; eating out once or twice a week may be     7    (afford) but doing this most days adds up. There could be an even     8     (high) cost on your health. Researchers have found that there is a direct link between the increase in food eaten outside the home and the rise in     9    (weigh) problems.

If you are not going to suffer this problem, then I suggest that the next time you go to your mum’s home     10     dinner, get a few cooking tips from her. Cooking food can be fun. You might also begin to notice the effects not only on your health but in your pocket.

Up to 82 percent of children with healthy mothers are not easy to be obese（肥胖的）, according to research. A mother,     1     has a healthy weight, exercises regularly, eats a healthy diet, doesn’t smoke and only     2    (drink) wine in moderation, is significantly less likely     3    (have)a fat child, scientists say.

And research suggests it could be more to do with nurture(养育)    4     nature, as a mother's lifestyle appears     5    (direct) linked to the health of her child. When both mother and child follow a healthy lifestyle, the risk of obesity     6    (reduce)even more, the study of more than 24,000 children found.

The study examined the medical history and lifestyles of more than 24,000 children aged nine     7     fourteen, born to almost 17,000 women in the US. Researchers looked at the link between overall mother health and likelihood of a child     8    (be) obese.

The mother's health was judged on her height-to-weight ratio(比例), her diet, amount of physical     9    (active), smoking status and how much alcohol she drank. A healthy weight and diet, regular exercise, no smoking and moderate drinking all reduce the chance of a woman having     10     obese child.

Despite many laws and     1     (nation) parks protecting tigers, their habitats (栖息地) continue to be destroyed and they are still being hunted. Tigers are among the most endangered species (物种) in the world nowadays. Altogether, there are no more than 5,000 tigers     2     (leave) in the wild. Some think that the tiger is already to the point of extinction in the wild. There are many reasons for this, like habitat loss and hunting.

Actually, over the last few years, a number of steps     3     (take) to help preserve the tiger. The Wildlife Conservation Society (WCS) was set up to protect wildlife and their habitats in     4     early 2000s. Today WCS is carrying out work in 53 nations across the world, protecting a great     5    (various) of species from butterflies to tigers. In 2010, WCS started Tigers Forever,     6     aim was to increase the number of tigers in the world by 50 percent in the next 10 years.     7     (achieve) their goals, they are working together with not only governments     8     other organizations to protect tigers and other wild species     9     dying out.

Right now the tiger population is increasing steadily under this program in India and in Far East Russia. Due to the hard work of WCS, these large cats have a     10    (good) chance of survival in their natural environments than ever, not just in zoos.

Be Careful on the Internet

Parents of boys at a Sydney private school have been urged to monitor their sons’ use of social networking website, with a warning     1     any mistakes made in teenage years could be permanently recorded on the Internet and catch up with them later in life.

The headmaster, Timothy Wright, wrote to parents on Thursday,     2    (explain) that younger boys were too immature to fully understand the possible consequences of disclosing private information on social networking sites. “We now know that those parts of the brain     3     deal with decision-making are still developing in a man in his 20s,” he said. “But mistakes     4    (commit) at fifteen may be still accessible to an employer ten years later.”

Modern technology means that a careless word, an ill-willed comment or an inappropriate photograph, are on permanent record and freely available to     5     has access. Stupidities that     6    (forget) immediately before now last, spread and damage in ways unknown before this decade.

Dr Wright said that     7     words spoken in the playground could be more easily forgotten, those captured on the Internet or on mobile phone text messages could have far more lasting and more hurtful consequences.

He urged parents to set ground rules for use of mobile phones and the Internet and in particular to set boundaries on taking and sending images that     8     be used to bully others. “Parents who are paying for the Internet service have an unquestionable right     9    (insist) they are a friend on social networking websites. I would certainly insist on this     10     at least the end of 16 if not later,” he wrote.

Young Chinese consumers are becoming fans of home-made brands and turning their back on foreign products.

According to a recent survey by weniuan.com, about 96% of the     1     (interview) young people said they were willing to purchase guochao products, which refer to products produced by homegrown brands. At the same time, 91.6% of them expressed their     2    (expectation) for more video programs digging deeper into traditional Chinese culture than before. Over the past decade, Chinese food, drink and personal care brands     3     (expand) their market share by 3.3% to nearly 70%.     4     (gradual), the opinion that foreign products are superior has been abandoned by Chinese youngsters.

The age group of the interviewees ranged from the post-90s generation     5    the post-2000s generation. Unlike older generations     6     might favor Western culture and brands, young Chinese people     7     (raise) when the country’s economy was taking off, so they tend to have strong confidence in their     8    (nation) identity and culture.

The young people, who nowadays have access to     9     wide variety of China’s cultural heritages, are carrying the responsibility of       10     (spread) Chinese culture. Obviously, they’re really doing well.