单项选择题
In this park, sparrows often fly down from trees to eat from visitors' hands. They are used to （）in this way.
A. be fed B. feed C. having fed D. being fed
单项选择题 We don't have any shoes in your（）
单项选择题 He thought nobody was around, but he was in fact seen （） into the office building.
单项选择题 I remember（） him once when I was staying with my aunt.
