B1 SB part 3b

p. 40 ex 1 question 2

p. 40 ex 1 question 4

p. 40 ex 1 question 6

p. 40 ex 1 question 8

p. 40 ex 2 question 1

p. 40 ex 2 question 5

p. 40 ex 3 question 2

p. 40 ex 3 question 5

p. 40 ex 3 question 7

p. 40 ex 3 question 9