Chapter 4, Exercise 1 (a) Chapter 4, Exercise 1 (b) Chapter 4, Exercise 5 (a) Chapter 4, Exercise 5 (b) Chapter 4, Exercise 5 (c) Chapter 4, Exercise 5 (d) Chapter 4, Exercise 11 Chapter 4, Exercise 12 (a) Chapter 4, Exercise 12 (b) Chapter 4, Exercise 15 Chapter 4, Exercise 22 Chapter 4, Exercise 23 Chapter 4, Exercise 27 (a) Chapter 4, Exercise 27 (b) Chapter 4, Vocabulary, Phrases Chapter 4, Vocabulary, Words