Unit 1 The Correct Word Unit 2 The Appropriate Word Unit 3 The Better Word Unit 4 Sentence Base Unit 5 Expanded Sentence Base(Ⅰ) Unit 6 Expanded Sentence base (Ⅱ) Unit 7 Joining Together (Ⅰ) Unit 8 Joining Together (Ⅱ) Unit 9 Sentence Variety Unit 10 Punctuation