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Section B (3a-3b-self check) Unit6 When was it invented ? * The first paper __________ (make) in China in 105 AD. For over 500 years the art of making paper __________ (limit) to China. In 610, papermaking ______________ (introduce) into Japan. Kites ___________ (know) in China about 3,000 years ago. was made was limited was introduced were known 检测积累 （一） * 5. Wheelbarrows ____________ (invent) in the Han Dynasty. 6. Gunpowder _______________ (discover) by the Chinese hundreds of years ago. 7. Soccer _____________ (develop) in England in the 12th century. were invented was discovered was developed * ①—Why didn’t you go to the party? —Because I wasn’t__________ (invite). ②My mother made me do some washing. (改为被动语态) I________ ________ ________ do some washing by my mother. invited was made t