UNIT ONE

UNIT TWO

UNIT THREE

UNIT FOUR

REVIEW ONE (Unit1-Unit4)

UNIT FIVE

UNIT SIX

UNIT SEVEN

UNIT EIGHT

REVIEW TWO (Unit5-Unit8)

UNIT NINE

UNIT TEN

UNIT ELEVEN

UNIT TWELVE

REVIEW THREE (Unit9-Unit12)

UNIT THIRTEEN

UNIT FOURTEEN

UNIT FIFTEEN

UNIT SIXTEEN

REVIEW FOUR (Unit13-Unit16)

APPENDIXⅠAbbreviations and Symbols

APPENDIXⅡA List of Irregular Verbs

APPENDIX III Phrases and Expressions

APPENDIX IV Proper Nouns

APPENDIX V Vocabulary