Answer:
i'm not sure what the question is. If it is to correct the grammar given, then it would be Mario and Judith <u>a</u><u>r</u><u>e</u><u> </u>studying for <u>a</u><u>n</u><u> </u>upcoming science exam.
What is this about? What story is this from?
Answer:
Hawthorne's principal literary device was the use of symbolism.
Hope it will help :)