讀一讀，聯(lián)系上下文將下列對(duì)話補(bǔ)充完整。  
A: Wang Bing,     1       
B: Fine, thank  you.
A: What's ten plus five?    
B:     2        
A: Sorry. You are wrong.     3      
1. How are you?   2. It's sixteen.   3. It's fifteen.
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