Exercise # 1

 Exercise # 2

 Exercise # 3

 Exercise # 4

 Exercise # 5

 Exercise # 6

 Exercise # 7

 Exercise # 8

 Exercise # 9

 Exercise # 10

 Exercise # 11

 Exercise # 12

 Exercise # 13

 Exercise # 14

 Exercise # 15

 Exercise # 16

 Exercise # 17

 Exercise # 18

 Exercise # 19

 Exercise # 20