Answer:
pebble
Lieutenant Jimmy Cross carries various reminders of his love for Martha, a girl from his college in New Jersey who has given no indication of returning his love. Cross carries her letters in his backpack and her good-luck pebble in his mouth.
Explanation:
To be completely honest, I don't know why he thinks putting a pebble in his mouth was a good idea. He might swallow it! And putting pebbles in your mouth isn't the best idea health wise, and it might damage his teeth!
-Army
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