Chuyển bị động các câu sau: 1. One finds metals in the earth. 2. One keep food in a refrigerator

Chuyển bị động các câu sau
1. One finds metals in the earth
2. One keep food in a refrigerator
3. We buy bread and cakes at the bake's
4. People sent lots of cards at christmas
5. We turn on the light when it dark