The beautiful Li River and its amazing surrounding scenery is one of the most well-known tourist destinations in China. However, the    1     (grow) in tourism meant the increase of the local population as well as     2     number of commercial and industrial enterprises. Chemicals used to increase crop production led to severe water quality issues,     3     (cause) a decrease in the number of fish species.

2 . Pollution is one of the biggest problems in the world today. In many places, rubbish is thrown into lakes and rivers.     1    

In some cities, the air is filled with pollution.     2     If it is not cleaned up, more people will be hurt.     3     Land and water pollution kills many animals every year.

If we do not act to improve the environment, more living things will be killed by pollution.

    4     We should separate rubbish into different groups. In this way, it can be recycled and reused. We had better plant more trees.     5     What’s more, we shouldn’t put the waste into lakes or rivers.

If we can do these, we will make the world a better place to live in.