第75页

信息发布者：


on
↗
↘
in
↘
keep
↗
↘
put
in
↘
√
√
√
×
×
×
on the ground
can't
sweep the floor
make the air dirty
clean
dirty
Yes, it is.
Rubbish. 
I can sweep the floor.
I can plant more trees.
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