Thousands of years ago, it was common to see many stars in the sky. However, this changed with the     1     (invent) of electricity. Cities have gone     2     (bright), using more lights. And that means most people in urban areas will never see beautiful groups of stars. They will never see a     3     (nature) night sky and never be inspired by it.

Today, people     4     (surround) by light－ even at night time. Much of this light travels where it shouldn’t be－it creates light pollution. For example, a person can put     5     light outside to shine on his own house. But the light could be so strong that it may also shine on his neighbor’s house. The extra light     6     (shine) on the neighbor’s house is one of light pollution.

But is all this light     7     (real) a big problem? People need light to see, work and drive safely at night. But scientists say that this extra light has proven     8     (effect) on living creatures. One kind of animal influenced by light pollution is birds,     9     travel to a different area to lay eggs, usually at night. But lights from tall buildings can lead them     10     their path.

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.