Помогите,инглиш!!!!!2 задание, passive voice

2.English isn't spoken in Great Britain only. It is spoken all over the world.
3. Ice cream isn't мейд of ice. It's made of cream.
4. Cars aren't built of glass. They're built of metal.
5. Cats aren't kept at zoos. The are kept at home. 
6.The Sun isn't seen at night. It is seen at day.