Find the mistake.

If you don’t pay (A) attention, you will (B) understand (C) the lesson (D).

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Jane: What about putting more trash cans on the streets?

Mary: _____________.

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The Friends of the Beach is organizing a campaign to clean _______ the Front Beach.

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A lot of people _______ trash into rivers and make the water polluted.

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A rare _______ is now killing many farm animals in the countryside.

If we _______ more trees, it will help reduce air pollution.

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We should take a bus often _______ we can help reduce air pollution in the city.

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We should clean up the beach _______ we should plant more trees along the coast.