单项选择题

The classroom is quite clean（） some waste paper on the floor.

A. except for  
B. besides 
C. except  
D. without

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One difficulty has been solved. But another one will（）

A. arise 
B. rise 
C. arouse 
D. arose
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In many cultures people insist（）that the importance of being punctual.

A. in   
B. over       
C. to      
D. on
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