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Should/shouldn't
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We ... (should/shouldn't) cut down trees.
We shouldn't cut down trees.
Oops!
Okay!
We ... (should/shouldn't) throw away paper.
We shouldn't throw away paper.
Oops!
Okay!
We ... (should/shouldn't) destroy tropical rainforest.
We shouldn't destroy tropical rainforest.
Oops!
Okay!
We ... (should/shouldn't) protect endangered species.
We should protect endangered species.
Oops!
Okay!
We ... (should/shouldn't) recycle plastic bags.
We should recycle plastic bags.
Oops!
Okay!
We ... (should/shouldn't) waste energy and water.
We shouldn't waste energy and water.
Oops!
Okay!
We ... (should/shouldn't) save forest.
We should save forests.
Oops!
Okay!
We ... (should/shouldn't) plant more trees.
We should plant more trees.
Oops!
Okay!
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