Are there any dangling modifiers or misplaced modifiers? And how could I fix the sentence to make it make sense?

“The broken singer’s umbrella was thrown in the trash can.”

“While walking to school, the bird flew past and landed in a tree.”

“Though only in the 3rd grade, the teacher realized that the student could read above her grade level.”

“Dotting the skies over Denver, the crowd stood in awe at the brightly colored hot-air balloons.”