Mn trả lời giúp em vs ( câu trả lời có giải thích với ạ) * Change the following active sentences into passive ones. 1: We plant trees in spring. A. Trees are planted in spring. B. Trees is planted in spring. C. Trees are plant in spring. D. Trees were planted in spring. 2: The villagers will prepare food for a disaster. A. Food was prepared for a disaster by the villager B. Food will prepared for a disaster by the villager C. Food will be prepared for a disaster by the villager D. Food were prepared for a disaster by the villager 3: We had bought some medicine before the picnic. A. Some medicine has been bought before the picnic. B. Some medicine had bought before the picnic. C. Some medicine had been buy before the picnic. D. Some medicine had been bought before the picnic 4: My father repaired the gate yesterday. A. The gate was repaired by my father yesterday. B. The gate are repaired by my father yesterday. C. The gate were repaired by my father yesterday D. The gate is repaired by my father yesterday.