textbook(exercise 1-10 unit 1)

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Page 1: Textbook(Exercise 1-10 Unit 1)
Page 2: Textbook(Exercise 1-10 Unit 1)
Page 3: Textbook(Exercise 1-10 Unit 1)
Page 4: Textbook(Exercise 1-10 Unit 1)
Page 5: Textbook(Exercise 1-10 Unit 1)