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第90页

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4/four

bins

B C F G

A D

is clean most of the time. But sometimes it's dirty. To keep our school clean, we

should sweep the floor and clean the desks and chairs every day. We shouldn't throw rubbish anywhere.

We should put it in the right bins. We should also plant more trees and flowers in our school. Trees and

flowers can make our school more beautiful and make the air fresher. Let's do it now!