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To keep safe is very important. When you are alone at home,

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To keep safe is very important. When you are alone at home, you should ______ to protect yourself.
①have a list of phone numbers to call for help, such as 110,119 and 120
②play computer games while boiling some water
③keep the door locked
④pay attention to the gas, water and electricity
⑤let anybody in immediately when you hear the doorbell      
[     ]
A. ①④⑤                      
B. ②③⑤                  
C. ①③④
To keep safe is very important. When you are alone at home,
C