1.set foot in
v. 踏进；进入；涉足于
仿I felt lost and terrified when I set foot in the office.
2.slouch
n. 下垂；笨拙的人，懒散的人；懒散的样子
vi. 没精打采地站；耷拉
vt. 使下垂
仿I'm no slouch but he was moving so fast.
3.swap
n. 交换；交换之物
vt. 与...交换；以...作交换
vi. 交换；交易
仿I wouldn't swap places with her for anything.
4.Summary
Harry,Ron and Hermione went back to the hall after seeing the big pumpkin in Hagrid's vegetable path. Professor McGonagall told Harry and Ron about their detention. They don't like their tasks.
