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第61页

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keep

clean

make

air

dirty

smoke

ground

messy

dead

slip

throw

plant

skin

take the bus and the metro to school

many museums

well done

pick it up

help keep the air clean

black smoke from factories

Billy slips on the banana skin and falls.

We can walk to school.

Bobby and Tina are walking home after school.

Bobby, you should put your rubbish in the bin.

There was rubbish in the water, and the fish were dead.

--What made the streets messy and dirty? --Rubbish made the streets messy and dirty.

rubbish

fall

bin

museum