Hunting and fishing have directly     1     the world’s animal populations. Some people hunt animals for food: whale meat is eaten in some parts of the world. Some people hunt animals for fashion: animal skin is used to make costs and bags. Still others hunt animals just for fun: deer are     2     and shot by people who enjoy the     3     of the sport.

Human activities that have     4     effects on animals can be just as harmful. When we build farms or factories, we destroy animal     5     and leave many animals with     6     to live, or no food to eat. We can also put animals in danger without ever entering their habitats. Air, water, noise and light pollution can all have a deep and     7     influence quite far from their source.     8     due to pollution     9     by ship traffic and other human activities, the dolphin population has dropped greatly. As the human population continues to grow,     10     does the effect we have on animals.

We all know it is not healthy to stay up late and poor sleep quality can leave us feeling low. However, many people still cannot get enough sleep, e    1     the young.

Over 60% of Chinese students aged 6 to 17 sleep       2     than eight hours a day, according to a report released by the Chinese Sleep Research Society(CSRS) on Marth 17. The study     3     nearly 70,000 children and teens aged 6 to 17 across the Chinese     4    , Hong Kong, Macao, and Taiwan.

According to the study, too much school homework is a major cause for inadequate sleep among young people. For example, from Monday to Thursday, 8.4 percent of them would still be     5    (occupy) in doing their homework after 11 p.m..     6     major cause of young people’s inadequate sleep is the frequent use of electronic devices.

Lack of sleep among children and teenagers has     7     concern in society. To reduce students’     8     burden, the Ministry of Education and eight other departments issued a guideline on Dec 28. It is suggested that local education authorities across China should take more     9     to help students get more sleep, including     10    (delay) the start of morning classes by half an hour.

Most teenagers tend to s    1     from growing pains during adolescence, during which they go through many   p    2     and psychological changes. For one thing, parents are       3    （严厉的）on their children. They cannot t    4     children’s improper behavior in daily lives.

They often c    5     that their children show too much enthusiasm for social media, which greatly reduces their concentration on study. For another thing, parents attach too much importance to a    6     performance of their children. Once children fail to live up to their expectations, they will get upset. Therefore, teenagers often feel stressed and even c    7     about their future.

To deal with the situation       8    （适当地），teenagers should communicate     9    （定期地）with their parents, which will definitely minimize their growing pains and achieve a b    10     between life and study.