a). Change the following sentence into passive form
1.We cannot exchange articles which customers have bought during the sale
2.It is high time someone told him to stop behaving like a child
3.Why did no one inform me of the change of plan
4.Men with slide rules used to do these calculations, now a computer does them
b).Correct the mistake
5.Different kinds of newspapers are arranging on the shelves
6.The novel writing by Mark Twain attracts a lot of children
7.Thank you very much for your letter, who came yesterday
8.There are a little activities that we can do after the meetting