ans: The bridge collapsed creating a tremendous boom.
ans: The classroom was a zoo.
Note the use of synecdoche in The Lady or the Tiger? by Frank R. Stockton:
“His eye met hers as she sat there paler and whiter than anyone in the vast ocean of anxious faces about her.”
“Faces” refers to people (not just their faces).
ans: The pen is mightier than the sword.
ans: the Sun smiled at us.