The Amazon is key    1    the health of the entire planet. It is the largest rainforest in the world,     2     (rough) half the size of the United States. Statistics show that nearly 20% of the oxygen     3     (produce) by the Earth’s land comes from the Amazon rainforest. It also puts an enormous amount of water into the atmosphere at a time     4     cities are drying up. The Amazon is sucking in carbon and greenhouse gases while slowing the rising temperatures.     5     it’s now burning at a record rate— with images from space     6     (show) the smoke covering much of Brazil.

It’s not the only major forest in danger. Nearly half of the world’s forests that     7     (stand) when humans started farming are now gone. The chief reason is the     8     (expand) of agriculture into forested areas. In Brazil it’s cattle ranching, soy production and logging, according to Nigel Sizer, tropical forest ecologist. “It is responsible for 80% to 90% of     9     loss of tropical forests around the world.” Environmental groups say these activities can     10     (slow) in a much more sustainable way.

Busy Colombians living in a city can be pressured. But there is a place for people to relieve stress in Bogota.     1    (sit) at the top of Monserrate Hill, east of the city, the place is a protected park for hummingbirds. The area contains a forest that has turned into a peaceful and     2     (harmony) world for both people and birds.

With the hummingbirds flying from flower to flower, some people study them through binoculars (双筒镜) and     3     (other) take pictures with cameras or phones.

“Sometimes it doesn't seem real because we are close to city of eight million residents     4     generate noise every day,” says Camilo Cantor, a caretaker in the park, whose job is to mix water and sugar and put it in bird feeders along a 300-meter path “The park is     5     (true) special place, like an oasis (绿洲). It is place where people can go     6     (ease) stress, forget about troubles and get     7     break from busy city life,” he added.

Ten years ago, the hill     8     (destroy), mercilessly and completely, meaning there were no trees left on it. But workers began to replant local trees and flowers to bring the forest back     9     life. Presently, visitors to the park can see over100 species of birds there.

Hummingbirds can     10     (find) only on the American continent and Colombia is home to many different kinds.

4 . Every year, the ancient Town of Fenghuang,    1    of China’s most well-known ancient towns, is visited by a large number of people from all over the world.    2    (fortunate), it was under water as heavy rain hit the centre of the country,    3    tens of thousands of people leaving from the area. Heavy rain and floods lasted for the past few days. Waters in the nearby river called the Tuojiang River rose by almost one meter above warning level,    4     (cause) heavy rainstorms. More than 120,000 local people and tourists have been helped to leave there because of the terrible disaster. And more than 4,000 shops in the town    5    (shut). Several bridges on the Tuojiang River have been damaged or destroyed. Water has flowed into many bars, restaurants and hotels in its ancient town, and electricity in the ancient town has been cut off.    6    the heavy rains have stopped, the popular tourist spot remains closed for local people’s     7    (safe).