Solemn but resolute, Boston marked the first anniversary of the Boston Marathon bombings Tuesday by remembering the dead and wounded, acclaiming the heroism of first responders and celebrating a sense of community. "You have become the face of America's resolve, for the whole world to see," Vice President Joe Biden told the 2,500 invited guests, including the families of four people who died. " … People know all about you. They know who you are. They know your pride, they know your courage." Tom Grilk, executive director of the Boston Athletic Association, said the ­slogan the city has adopted since the bombing, "Boston Strong," means "to be borne on by an inner and enduring strength, and it means, above all, that we never, ever give in to anything." The 118th running of the 26.2-mile race is next Monday.