when was the ...invented? who were they invented by? what ane they used for?造一对话.如上

when the boy was when was the book published? when was the car invented when was the birthday party when was the machine produced when was the meal?意识 一个托福口语问题 100字左右 .Do you think computer is the most important inve the day when the article was written when was the Nanpu Bridge build? When was the saying first used?翻译 when the weather was warm翻译 When was the writer ofthe book b____? When was the day 什么意思 When was the first Earth Day celebated? WHEN THE PIE WAS OPENED怎么样 When was the Internet set up? when was the digital camera developed是什么意思 When the train was starting是什么意思