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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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