根据句意，在答题卷标有题号的横线上，写出括号内所给单词的适当形式。
Our class room is on the_______ (one) floor.
The bag on the chair is one of the _______ (hero).
We can keep __________ (diary) every day. It’s interesting.
I am___________(real) sorry for that.
David goes ___________(walk) with his parents after dinner every day.