2 Read the text below. Fill in each gap (1 - 4) Smog The word 1) with the appropriate word. is a combination of the words smoke and fog. In many areas around the 2) reached extraordinary levels. Some governments have quickly reacted with severe measures in response to the problem. smog has Modern Los Angeles suffers severely from smog, as London did in the 19th 3) These two areas released certain chemicals into the 4) and created a foggy atmosphere. In London, where fog levels have now fallen far below those of years ago, people were often unable to see their hands and sometimes could not walk around. It took a long time for governments to act and control smog.

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