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    Mrs White works in a middle school. It is Sunday. She has no classes. At 10 am, she goes to a shop. There she buys a nice dress for herself. She puts it in her bag and then buys some cakes for her children. At 11: 15 a.m., she gets home. She wants to put on her new dress. but she can't find her bag. She telephones the shop assistant.He says,"We find three bags here. But which one is yours?”