Teenagers' safety has become a big problem which catches everyone's attention nowadays.
Students should know the way of saving and protecting themselves any minute.As teenagers，we will be much safer if we________.
①never tell anyone online our real names or addresses
②don't walk alone outside at night
③fight with the stranger who is following us
④don't use earphones when running in the schoolyard or on the street
⑤accept anything to drink or eat that's offered by others in a strange place（　　）