问题
                    
If we __________ careful,fire can be dangerous。
                            A:don’t be
B:are
C:aren’t
D:won’t be
                        
                        B:are
C:aren’t
D:won’t be
正确答案是:
                        
                        
                        
                    同类题型
                    How do people usually ___________ in the office?
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These aren’t ________ cards. They’re_______
M r Smith, would you please speak a little more ________?—Sorry ! I thought you could follow me.