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在短文的空格内填入适当的单词(首字母已给出)

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在短文的空格内填入适当的单词(首字母已给出)
Stephen is an environmental engineer.He works in many p——,both indoors and outdoors.He works for companies and for the government.
Today he is looking f——dangerous gases.Some of these have no t——
or smell,but they can poison people,animals and plants.He is testing the dirt,a——and water near a large factory.He is digging a hole in the ground.He is using special tools to collect samples.
Many countries need environmental engineers.In the modern world,more governments are paying for a cleaner environment.They do not want factories to p——the earth,air and water.They also want the factories to keep the gas in a safe way.
places
for
taste
air
pollute