帮变一下被动语态

题目

帮变一下被动语态
1.Thomas Edison invented the light bulb.
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2.Dr Bell invented the telephone.______________________________
3.People invented paper making in Eastern Han Dynasty.
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4.Shen Nong discovered this beverage over three thousand years before that.
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5.People use stamps for sending letters.

答案

1 The light bulb was invented by Thomas Edison.2 The telephone was invented by Dr Bell.3 Paper making was invented by people in Eastern Han Dynasty.4.This beverage over three thousand years before tha...