用横线画出句中错误并改正。
1. Sorry, where's the camera?                                                      
2. What's a nice school bag!                                                    
3. Mum, where's cake?                                                    
4. I don't find Mum. Where's she?                                                    

【考点】定冠词（the）,疑问代词,情态动词,日常用语、谚语

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