1 . 该保护区是西藏西北部动植物的庇护所。
The reserve is ________ ________ ________ the animals and plants of northwestern Tibet.

2 . 也许最好的例子就是联合国教科文组织，它开展了一项防止世界各地世界文化遗产消失的计划。
Perhaps the best example is shown by UNESCO, which runs a programme that________world cultural heritage sites around the world ________ disappearing.

3 . 在进步与文化遗址保护之间寻找并保持适当的平衡可能是一个巨大的挑战。
Finding and keeping the right ________ ________ progress ________ the protection of cultural sites can be a big challenge.