将下列句子改为被动语态（英语）
将下列句子改为被动语态：
1.We found some jewels in a box.
2.Thomas Edison invented the light bulb.
3.People use stamps for sending letters.
4.Farmers grow rice in the Sonth of China.
5.He gave me a new dictionary this morning.
6.The boy didn't throw the stone just now.
7.He doesn't operate this machine.