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Welcome back
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Unit 1: City & Countryside
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Unit 2: Disasters & Accidents
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Unit 3: The environment
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Review (Units 1 - 3)
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Unit 4: Culture & Ethnic groups
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Unit 5: Teenagers' life
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Unit 6: Space & Technology
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Review (Units 1 - 6)
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Songs
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Going green
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Culture
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Vocabulary Expansion
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Grammar Reference
