CONTENTS 1
Lesson One 1
Lesson Two 22
Lesson Three 46
Lesson Four 67
Lesson Five 88
Lesson Six 112
Revision Exercises（Lessons 1－6） 134
Lesson Seven 140
Lesson Eight 163
Lesson Nine 185
Lesson Ten 208
Lesson Eleven 231
Lesson Twelve 252
Revision Exercises（Lessons 7－12） 276