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¡¡¡¡¡¡¡¡¡¡¡¡________ of people are busy ________ trees, they are helping to make our country
beautiful.[
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£®Thousand, to plant¡¡¡¡¡¡B£®Thousands, plantC
£®Thousand, planted¡¡¡¡¡¡D£®Thousands, planting
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