Unit 1 1 Part I Text Exercises 1 Part II Exercises for CET-4 9 Unit 2 23 Part I Text Exercises 23 Part II Exercises for CET-4 31 Unit 3 45 Part I Text Exercises 45 Part II Exercises for CET-4 55 Unit 4 67 Part I Text Exercises 67 Part II Exercises for CET-4 75 Test yourself（for Units 1-4）88 Unit 5 96 Part I Text Exercises 96 Part II Exercises for CET-4 104 Unit 6 119 Part I Text Exercises 119 Part II Exercises for CET-4 128 Unit 7 142 Part I Text．Exercises 142 Part II Exercises for CET-4 150 Unit 8 164 Part I Text Exercises 164 Part II Exercises for CET-4 173 Test yourself（for Units 5-8）188 Test yourself（for CET-4）196 Key and Tape script for Workbook（3） 211
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