Притяжательный падеж English

The test of James was bad.
The backpacks of the children are cute.
It's the birthday of my mother.
The ingredients of the pizza are spicy.
The bike of Paul is white.
The kite of my brothers is yellow.
The paper of the bad is strong.
ПОМОГИТЕ!

James' test was bad.The children's backpacks are cute.It's my mother's birthday.the pizza's ingredients are spicy.Paul's bike is whitemy brother's kite is yellowthe bad's paper is strong