根据句意和汉语注释，写出单词的正确形式。
There are five classrooms on the _______ (one) floor in our school.
Millie likes going _______ (shop) with her mother at weekends.
The _______ (hero) in the story are great. I like them very much.
We often do after-school _______(activity) at 3:00 p.m.
Today is our School Open Day. There is a _______ (parent) meeting in the afternoon.