There is a system ________the waste is disposed of using the principles of ecology.
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The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
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“Drive-ins” have large parking lots _____ customers are served in their cars by waitress.
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The user also wears special gloves to ‘touch’ the people and objects _______ he or she sees.
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The time is not far away ___ modern communication will become widespread in China’s vast countryside.
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