When was it invented?
主语+ was / were + 过去分词+ by …
The teacher was visited by them two years ago.
Fill in the blanks with the correct form of the given verbs.
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.