________ of this term, we will have learnt 4 books

I wrote a letter to John for his help during my highschool years. without which Ithe college entrance exam.

下列各句中，表达得体的一句是( ）

This is my _______room. _________room is tidy.

Everyone knows _____ is dangerous to play with fire, but _____ is difficult is to prevent children from playing with fire. [ ]