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1．We drink water and use water to clean things every day.
( )2．We should not drive so much because cars use a lot of energy.
( )3．Trees help keep the air clean.
( )4．We use plastic to make bags and bottles.
( )5．We can walk to school.
( )6．We should put the rubbish in the bins.
( )7．We can plant more trees to keep the air clean.
( )8．—What does the sign mean?
( )—It means“No parking”.
9．We should use paper bags and glass bottles.
( )10．—What are you going to do at Chinese New Year?
( )—I'm going to light firecrackers.
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