"Unsupported and exaggerated statements" would be something that best characterizes an unreliable narrator, but this is of course somewhat subjective.
Answer: Although they lost the black box, using stone is part of the ritual
Explanation:
Although the may have forgotten the ritual and lost the black box, but townspeople remember the use of stone on any one that pick a paper with black dot.
1)help your parents
2) do your homework that given by your teachers
3) going to the tuition class