The doctor ____ is leaving for Africanext month

nce worked ina remote mountain village school, which is _____ only on foot

There is ________ “s” and________ “u” in the word “student”.

Time goes by so fast . We must never miss thechance to show love for our parents and make them _____ how much they mean tous .

关于元杂剧的一些分析判断，有错误的一项是（ ）