Unit One 1
Unit Two 4
Unit Three 8
Unit Four 11
Unit Five 15
Unit Six 18
Unit Seven 21
Unit Eight 24
Unit Nine 28
Unit Ten 31
Unit Eleven 34
Unit Twelve 37
Unit Thirteen 40
Unit Fourteen 44
Unit Fifteen 47
Unit Sixteen 50
Unit Seventeen 53
Unit Eighteen Sample Test 1 56
Unit Nineteen Sample Test 2 61
Unit Twenty Sample Test 3 66
Tapescripts 70
Key to the exercises 158