第64页

信息发布者：
many
keep
keep
is cleaning
sweeping
to make
puts
him
factories
pick
throw
museums
in your city
paper
make this/the park dirty and messy
to keep our city clean
take the bus or metro
on the ground/floor
Do you throw rubbish in the bin？Yes, I do.
We can go to school on foot.
There is a museum in the city.
What can you do to keep your school clean？
Smoke from cars makes the air dirty.
F
F
T
F
T
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