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Grammar Focus
A Check the correct sentences.
1 a. Smog, mostly from cars, and factories, are one cause of air pollution.
b. Smog, mostly from cars, and factories, is one cause of air pollution.
2 a. Air pollution can make it hard for people to breathe.
b. Air pollution can make it hard to people to breathe.
3 a. It is caused to the garbage people produce.
b. It is caused by the garbage people produce.
4 a. The algae grow excessively because of the fertilizer.
b. The algae grow excessively because from the fertilizer.
5 a. No one wants living in a polluted environment.
b. No one wants to live in a polluted environment.
B Choose the correct words to complete the sentences.
1 When they die, they sink to the bottom and ( decay / decays ).
2 As ( more / many ) garbage piles up in landfills, the waste material seeps
into the ground.
3 The soil becomes ( polluted / pollute ) and causes diseases in humans.
4 ( Use / Using ) recycled paper napkins and reusable plastic containers.
5 The decaying process uses oxygen ( that / what ) we need to survive.
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