In the past hundred years, there have been violent natural disasters occurring worldwide, such as     1    （洪水）,     2    （干旱），mudslides and     3    （地震）. The disasters have caused millions upon millions of people deaths,     4    （毁坏）countless homes, and wiped out numerous pieces of fertile land.

Now more and more people become aware that what we have done have done damage to the earth. So it is     5    （紧急的）for us to stop damaging it, and to do our best to     6    （保护）it, for we have nowhere to go and survive except where we are now.

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.

Tibetan antelopes live on the plains of Tibet, Xinjiang and Qinghai. Watching them move slowly     1     the green grass, I’m     2    (strike) by their beauty and also reminded of the danger they were in. They were hunted     3    (legal) for their     4    (value) fur.

Economic development is necessary if we want to improve society. There comes     5     time when the old must give way     6     the new and it is not possible     7    (preserve) everything from our past as we move towards the future. Finding and     8    (keep) the right balance between progress and the protection of cultural sites can be a big challenge. Big challenges, however, can sometimes lead to great     9    (solve).

By     10     (share) so many digital photos over the Internet, the group hopes to promote even     11     (wide) interest around the world in China’s ancient history, culture and traditions. They also hope to     12    (far) educate people about the importance of safeguarding historic and cultural relics for future generations to understand and appreciate.     13     one researcher who is working on the project explains, “Appreciating one’s own cultural heritage is very important for understanding     14    (one). Appreciating the cultural heritage of other countries is very important for international     15    (communicate) and understanding.”