Paper is mainly made of cellulose (纤维素) This molecule (分子) makes up the cell walls of trees and many other plants. Because of its sturdy (结实的) structure, cellulose can     1     (use) repeatedly in paper making. Unfortunately, it also means that paper waste takes a     2     (surprise) long time to decompose (分解) after       3     (be) buried in landfills (废物填埋地) So far, trees are the only source of cellulose     4     can fill the massive (巨大的) demand for paper products.     5     (recycle) paper is therefore simply one of the best     6     to save trees.

Effective recycling requires a consistent effort from everyone at all levels of society. The way     7     (begin) is with education and understanding. Once enough people realize the need for recycling, more effective recycling systems can be implemented.

The need is     8     (really). The massive     9     (lose) of trees affects everybody on earth. Everyone     10     do their part to recycle paper and encourage government and industry to do the same. The world will be a better place for it!

According to officials in China, the giant panda is no longer listed as endangered. After working for many years to increase     1     (they) numbers, there are now more than 1800 giant pandas     2    live in the wild. The International Union for Conservation of Nature     3     (remove) the giant panda from the endangered list in 2016. At the time, Chinese officials didn’t agree with the     4     (decide). However, now they do. China has worked for decades to increase the number of these black and white bears because they are regarded     5     national treasures. China has worked to enlarge the pandas’ habitat. They have also made sure that there is plenty of bamboo for them to eat by     6     (plant) more bamboo forests. This has helped increase the number of pandas and stop them from dying out China will continue to support the giant panda population. Alongside efforts     7     (increase) the number of giant pandas in the wild, zoos around the world have breeding programmes. These     8     (design) to help increase the number of giant pandas which in captivity (圈养).     9     (hopeful) the giant panda will have     10    bright future with continued conservation efforts. We certainly hope so. We couldn’t bear to lose them.

Microplastics, referring to plastic fragments and particles (碎片和微粒) less than 5 millimeters in diameter (直径), have been found on Mount Qomolangma as high as 8,440 meters above sea level, just 408.86 meters below the peak of the mountain, according to a recent study published in the journal One Earth. Scientists collected snow and water samples from 19 different     1     (spot). They found microplastics in all the water samples and part of the snow samples. The most     2     (pollute) sample was from the Base Camp in Nepal,     3    most human activity on the mountain is concentrated. It had 79 particles of microplastics per liter (升) of snow.

The beautiful Li River is one of the     1     (famous) tourist destinations, but the     2     (grow) in tourism has had negative effects on the river’s water quality. This report looks at the problem of water pollution and some actions that have been taken to deal with it.

Water quality in the Li River had suffered     3     (great) from an increasing volume of tourists, many of     4    frequently threw garbage into the river. Many tour boats contributed     5     the problem too. The local population rose rapidly, as well as     6     number of commercial and industrial enterprises. Water pollution levels increased, with more household and commercial waste ending up in the river. To feed more people, more chemicals     7     (use) to increase crop production. These chemicals led to severe water quality issues,     8     (cause) a decrease in the number of fish species.

Finally, a series of urgent steps were taken     9     (restore) the river’s original beauty. It     10     (believe) that the beauty of the Li River will be preserved for generations to come.