Practical Exercises 1
Unit 21 1
Unit 22 13
Unit 23 25
Unit 24 35
Unit 25 45
Unit 26 54
Unit 27 62
Unit 28 71
Unit 29 79
Unit 30 87
Unit 31 95
Unit 32 104
Unit 33 112
Unit 34 120
Unit 35 130
Unit 36 140
Unit 37 147
Unit 38 155
Unit 39 164
Unit 40 174
Scripts 184
Unit 21 184
Unit 22 191
Unit 23 197
Unit 24 203
Unit 25 209
Unit 26 214
Unit 27 220
Unit 28 225
Unit 29 231
Unit 30 237
Unit 31 243
Unit 32 249
Unit 33 254
Unit 34 260
Unit 35 266
Unit 36 273
Unit 37 279
Unit 38 285
Unit 39 291
Unit 40 297