prof＝professor，take attendance 点名。
＊God， I only missed two classes and I＇m already out of it.
be out of it 是跟不上的意思，所以得 catch up with them ASAP
＊Hey， I got the whole info from the upperclassman.
info＝information， upperclassman 学长，也可能学长为seniors或 older guys
＊That guy is a tough nut. I guess this class is a bear！
难缠的老师称为 tough nut，bear表示很难的科目。
＊ I struggle for words when asked a sudden question.
struggle for words 难以回答