4. Complete this passage by filling in suitable prepositions.
There are three main kinds
________ pollution that affect the lives ________ people ________the city. They are air, noise and water pollution. The number ____________vehicles_____ the roads is the chief cause________air pollution. The poisonous fumes emitted
_________ the exhaust pipes_________cars and buses constantly add_______the level______
______carbon dioxide______
the air, thus reducing the purity _________the air it is this poisonous air devoid_____
the right content______
oxygen that causes breathing disorders leading________a number ________cases_______
asthma and bronchitis.
Another major factor that contributes________
air pollution is the number_______
factories and small industries where they discharge effluents that mix freely_________ the air we breathe.
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Answer:ofoff
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