Book One 1
Unit One 1
Unit Two 12
Unit Three 22
Unit Four 29
Unit Five 38
Unit Six 46
Unit Seven 54
Unit Eight 62
Unit Nine 70
Unit Ten 77
Test Yourself:Test Paper 1 85
Book Two 94
Unit One 94
Unit Two 105
Unit Three 113
Unit Four 122
Unit Five 130
Unit Six 137
Unit Seven 144
Unit Eight 152
Unit Nine 162
Unit Ten 169
Test Yourself:Test Paper 2 175
Book Three 185
Unit One 185
Unit Two 193
Unit Three 201
Unit Four 208
Unit Five 214
Unit Six 221
Unit Seven 230
Unit Eight 240
Unit Nine 250
Unit Ten 261
Test Yourself:Test Paper 3 271
Book Four 280
Unit One 280
Unit Two 290
Unit Three 300
Unit Four 310
Unit Five 320
Unit Six 331
Unit Seven 342
Unit Eight 353
Unit Nine 363
Unit Ten 374
Test Yourself:Test Paper 4 386
Appendix： 395
Key to Test Paper 1 395
Key to Test Paper 2 395
Key to Test Paper 3 396
Key to Test Paper 4 398