Economic development is necessary if we want     1     (improve) society but finding and keeping the right balance between progress and the protection of cultural sites can be a big challenge, which can sometimes lead to great solutions. Perhaps the     2     (good) example is shown by UNESCO,     3     runs a programme that prevents world cultural heritage sites around the world from     4     (disappear).

In the 1950s, the Egyptian government     5     (want) to build a new dam across the Nile, but the proposal led to protests because water from the dam would likely damage some temples and destroy cultural relics. Finally, the government turned     6     the United Nations for help.

A committee     7     (establish) to limit damage to the Egyptian buildings and prevent the     8     (lose) of cultural relics. The group asked for contributions from different departments and raised funds within the international community. Fifty countries donated nearly $80 million to the project.

When the project ended in 1980, it was considered     9     great success. As is shown, if a problem seems too difficult for a single nation, the     10     (globe) community can sometimes provide a solution.

In 2009, Whitacre received a video of a girl who was singing one of his works.     1    (inspire), he asked his fans to make videos, which he then joined together into one performance. His first virtual choir, “ Lux Aurumque”, had 185 singers from 12 different countries. Since then, the virtual choir     2    (become) a worldwide phenomenon. Whitacre’ s next effort was the Virtual Youth Choir for UNICEF,     3     was seen for the first time on stage on 23 July 2014 in the UK. Altogether, 2,292 young people from 80 countries joined in to sing Whitacre’s song “What If”.

If you are given the opportunity    1    (sing) together with hundreds of other people while at home alone, you can take part in a virtual choir. All you need is a video camera and    2    Internet connection. A virtual choir helps connect ordinary people together and enables them to add their voices    3     those of other individuals and become part of the global community, which    4    (prove) to be a positive influence on the lives of many people.

The virtual choir was created by award-winning composer and conductor Eric Whitacre,     5     began studying music at the University of Nevada in 1988. He was moved by Mozart’s classical music during his study at the University of Nevada. After graduation, his    6    (origin) compositions began to be familiar to singers and choirs. In 2009, he received a video of a girl who was singing one of his works.     7    (inspire), he asked his fans to make videos, which he then joined together into one    8    (perform). His first virtual choir has received millions of views on the Internet. Since then, the virtual choir     9    (become) a worldwide phenomenon. The virtual choir is a wonderful way for people around the world to sing with one voice, thus    10    (make) the world a better place.

In 1965, Millard and Linda Fuller decided to trade their lives as millionaires for a simple life helping others. They made this decision after visiting a community-run farm,     1     everyone worked together and helped each other. The farm inspired the Fullers and in 1976, they founded Habitat for Humanity,     2     non-governmental organization aimed     3     building houses worldwide for poor people.

Habitat houses are built by volunteers, and the materials used to build the houses     4     (donate). Because the Fullers believe that people should work to improve their own lives, those who receive a house must also spend hours     5     (help) build their homes.

Believing that people should help     6     (they), the Fullers want to ensure that houses are not     7     (simple) handed to people in need. Habitat houses are not free, but they are     8     (expensive) than other houses because the organization does not profit from them.

Today there are volunteers all around the world. Since 2000, many volunteers, including middle school and university students,     9     (build) houses for people in need. By building houses and helping them take     10     (responsible) for their lives, Habitat for Humanity is building hope around the world.

The China International Search and Team (CISAR) was founded in 2001 and now consists of many rescue workers and about 14 sniffer dogs.

After long and careful training,     1     team started its first rescue missions in 2003. It was the first time that Chinese team     2    (go) abroad, and the team was highly praised for their    3     (brave) and skill.

The CISAR has helped a lot by all means     4    then. The list of people to     5     help has been given is long. The team treated over 2000 people who     6     (injure) in the 2004 earthquake in Indonesia, spent several months     7     (aid) more than 20, 000 victims of the 2006 floods in Pakistan, and built many shelters     8     survivors whose homes had been destroyed in Thailand in 2008.

Rescue workers are     9    (careful) trained to find people, provide medical care and hand out supplies. After a disaster, there is usually no electricity or water, and there may be diseases and accidents. So they must have big     10    (heart). The members of the CISAR are always ready to help.

Today, giant pandas are considered to be one of the world’s best-known animals. People make huge efforts     1     (protect) them and luckily their efforts are paying off in some areas.     2     (global) recognized as a leading symbol of both China and nature conservation in general, giant pandas are popular in the world. But global interest in the animal only     3     (take) off in the 20th century.

The inspiration for WWF’s logo (标识) came from Chi Chi,     4     giant panda that arrived at London Zoo in 1958. Being aware of the need for a remarkable symbol to break through all language barriers, one of the WWF’s     5     (founder) agreed to make the big furry panda with her distinctive black and white coat a great logo. The first pieces     6     were done by the British environmentalist and artist Gerald Watterson became modestly successful. Later,     7     (base) on these drafts, Sir Peter Scott, drew the first logo. He said at the time, “we want an animal that is beautiful and endangered, and is loved for its     8     (attract) qualities. We also want an animal that is black and white to cut printing costs. To our relief, we make     9     eventually.”

The panda has ever since become a symbol not just for WWF,     10     for the conservation movement as well.