Unit 1 Lesson One 1
Lesson Two 10
Lesson Three 13
Unit 2 Lesson One 22
Lesson Two 29
Lesson Three 37
Unit 3 Lesson One 43
Lesson Two 52
Lesson Three 58
Unit 4 Lesson One 63
Lesson Two 69
Lesson Three 76
Unit 5 Lesson One 82
Lesson Two 87
Lesson Three 96
Unit 6 Lesson One 103
Lesson Two 109
Lesson Three 118
Unit 7 Lesson One 128
Lesson Two 133
Lesson Three 144
Unit 8 Lesson One 154
Lesson Two 160
Lesson Three 167
Unit 9 Lesson One 175
Lesson Two 182
Lesson Three 191
Unit 10 Lesson One 202
Lesson Two 208
Lesson Three 216
附录1 生词和词组 224
附录2 Irregular Verbs不规则动词表 236