I’m glad I went over all my notes;otherwise _____

My mother says she will cancel the family trip. I really can’t understand.— . You were looking forward to it.

aven’t seen each other for _______,though we are in the same city

You look worried. What’s your________—I have trouble learning English.

依次填人下列各句横线处的成语，最恰当的一组是（ ） ①学校足球队的守门员突然身体不适，我这个替补队员只得 ___________ ，上场守门。②当时中国革命的洪流势不可挡，其间难免有泥沙俱下、___________ 的现象。③北京潘家园文物市场有不少 ___________ 的赝品，如果没有专业的文物鉴别知识，就容易上当。