He was running late for class and forgot his book, but he didn't realize that until he was already in the what?\nOptions:\n- school room\n- lecture hall\n- discount store\n- bedside table\n- classroom
Let's think step by step below.
school room
Books are carried into the school room.

School room is a place inside the school.

School room is a place outside the classroom.

.

The final answer: school room