Выбрать правильный вариант притяжательного существительного Choose the right variant: a. Children's/childrens' day is celebrated in many countries. b. These are Peter's and Sam's/Peter and Sam's bicycles. You can take them. c. My friends's/friends' cars are very fast and modern. d. My father's-in-law/father-in-law's workshop is full of interesting equipment
a. Children's
b. Peter's and Sam's
c. friends'
d. father-in-law's