B2 WB part 8b p 90-91

p. 90 ex 1 question 1

p. 90 ex 1 question 3

p. 90 ex 1 question 5

p. 90 ex 2 question 2

p. 90 ex 2 question 4

p. 90 ex 2 question 6

p. 90 ex 2 question 8

p. 90 ex 3 question 1

p. 90 ex 3 question 3

p. 90 ex 3 question 5