仔細(xì)看圖片,回答問題。
1. What are they doing?
                                
2. What is the frog doing?
                                 
3. What are they doing?
                                 
4. What are they doing?                                                    
                                 
5. What is the dog doing?
                                 
1. They are planting trees.        
2. The frog is singing.       
3. They are skating.       
4. They are playing.        
5. The dog is sleeping.
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