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Unit 17  Prepositions (Time)                       58

                Unit 18  Prepositions (Place)                      60

                Writing Exercise 17-18                             62
                Unit 19  How Questions                             64

                Unit 20  How often~ Questions                      66

                Writing Exercise 19-20                             68
                Unit 21  Why Questions                             70

                Unit 22   Conjunctions                             72

                Writing Exercise 21-22                             74

                Unit 23   Comparatives • Superlatives              76

                Unit 24   As~as                                    78
                Writing Exercise 23-24                             80

                ★ Progress Test 3                                  82



                                                     Unit 25   Past Simple (be-Verb)                    84

                                                     Unit 26   Past Simple (Action Verb)                86

                                                     Writing Exercise 25-26                             88
                                                     Unit 27   Past Continuous                          90

                                                     Unit 28   Present Perfect                          92

                                                     Writing Exercise 27-28                             94
                                                     Unit 29   Passive                                  96

                                                     Unit 30   Passive Questions                        98

                                                     Writing Exercise 29-30                            100

                                                     Unit 31   Gerund                                  102

                                                     Unit 32   Gerund • to-Infinitives                 104
                                                     Writing Exercise 31-32                            106

                                                     ★ Progress Test 4                                 108

                                                     Appendix                                          110
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