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          To be safe, everyone _______ wear a seat belt when the plane takes off．
            
          A．is used to            B．used to       C．is supposed to           D．is able to
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          To be safe, everyone _______ wear a seat belt when the plane takes off．
            
          A．is used to            B．used to       C．is supposed to           D．is able to
          

			
          
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