Постройте предложения в форме страдательного залога

1. Galaxy chocolate was made in Cadbury.

2. The Olympics are held every four years.

3. Snails have been eaten in France since the ancient time.

4. Presents are given every year at Christmas in my childhood.

5. Gold coins will not be used in buisness in ten years.

6. Pearls were found inside oysters by divers.