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信息发布者：

made
made
keep
take
move
factories
walk
1 b 2 a 3 d 4 c
a. S1: Throwing rubbish makes the classroom messy. S2: We can put the rubbish in the bin.
b. S1: Littering makes the park dirty. S2: We can pick up the litter.
1 made, made 2 keep, take 3 move 4 factories 5 walk
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