You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.

the road part of which had been cut so deeply into the soft soil that the banks fringed ____ blooming wild cherry trees and slim white birches were several feet above their heads the child put out her hand and broke off a branch of wild plum that brushed against the side of the buggy
with