There’s a lot of _______ in big cities like Delhi or Beijing., A) dust storms, B) air pollution, C) vacuum cleaner, When the air is very bad, some people _______., A) take in smog, B) wear face masks, C) be mainly caused by, Some people _______ after running outside on a hot, polluted day., A) raise awareness of, B) have difficulty breathing, C) release clean air, The pollution in the air in our city is _______ car traffic and factory smoke., A) (be) mainly caused by, B) smog particles, C) vacuum cleaner, _______ from cars is one of the biggest sources of air pollution., A) exhaust fumes, B) Environmental Protection, C) clean air, You can see _______ rising from the top of old industrial buildings., A) wear face masks, B) factory smoke, C) air purifier, In some desert areas, people have to stay inside because of _______., A) dust storms, B) take in smog, C) be at risk, Babies and old people _______ when the air is full of smog., A) a tower was erected, B) (be) at risk, C) vacuum cleaner, To clean up the city’s air, _______ in the central park., A) an air purifier, B) a tower was erected, C) release clean air, After cleaning the air, the tower can _______ into the environment., A) raise awareness of, B) wear face masks, C) release clean air, I bought an _______ for my bedroom because the air was dusty., A) air purifier, B) dust storms, C) tower was erected, We clean the carpet with a _______ every Saturday., A) be mainly caused by, B) vacuum cleaner, C) factory smoke, This device doesn’t use gas — it _______., A) runs on renewable power, B) be at risk, C) exhaust fumes

Focus 2 | Unit 8.4

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