Under no circumstance （）to tell lies to parents．

There has been a great increase in retail sales , （）﹖

A.does there    
B.isn't there  
C.hasn't there     
D.isn't it

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The professor said he could talk on （）interested the audience．

A.any topic   
B.which topic 
C.whichever topic  
D.the topic he thought it

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