九年级英语Unit 9 When was it invented 造3组对话!

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九年级英语Unit 9 When was it invented 造3组对话!
用When was .invented?Who was the invented by?What was the used for?三个句型编对话,要有问有答的,

When was computers invented?
Who was chopsticks invented by?
What was calculator used for
再问：我要的是课外的，我们老师布置的家庭作业，要编三组对话，一问一答的！
再答：哦，早说嘛。重新来啊！ What are you doing? I am looking for a light bulb. Do you know when was the light bulb invented? Um……I think it was invented in 1854 Right.It was invented by Heinrich Gbel.But some people think that the light bulb was invented by Thomas Alva Edison。 Oh.I don't know.The light bulb was used for lighting.It is useful. Yeah.Look!There is a light bulb under the bed.

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