英语口语：课堂常用英语怎么说

　　＊I wonder if the prof took attendance already.
　　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