Introduction

Table of Units

Unit 1

Unit 2

Unit 3

Unit 4

Revision Exercises（Unit 1—Unit 4）

Unit 5

Unit 6

Unit 7

Unit 8

Revision Exercises（Unit 5—Unit 8）

Unit 9

Unit 10

Unit 11

Unit 12

Revision Exercises（Unit 9—Unit 12）

Appendix 1 A List of Irregular Verbs

Appendix 2 Phrases and Expressions

Appendix 3 Vocabulary

Appendix 4 Proper Names

Acknowledgements