Detailed Instructions: 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.
Problem:whence you got a glimpse of the bloom white cherry trees in the left orchard and nodding slender birches down in the hollow by the brook was greened over by ____ tangle of vines here sat marilla cuthbert when she sat at all always slightly distrustful of sunshine
Solution:
a