Units 19 to 24

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Unit 19

Page 39 audio

Page 40 audio

Unit 20

Page 41 audio

Page 42 audio

Unit 21

Page 43 audio

Page 44 audio

Unit 22

Page 45 audio

Page 46 audio

Unit 23

Page 47 audio

Page 48 audio

Unit 24

Page 49 audio

Page 50 audio