từ cđ=> bđ; bđ=> cđ
1. they grow rice in the north
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2 people used oil-lamp years ago
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3 the girl did not give me the money
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4 noboby told me the story
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5 oil lamps were used years ago
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6 when did they open that hospital?
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7 the house was broken into
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8 when will the shop be opened?
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9 bill will invite Ann to the party
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