“My roommate walked into the room. Immediately, I knew that
something was wrong.” means: _______ I knew that something was
wrong.

By the time my roommate came into the room,
As soon as my roommate entered the room,
Before my roommate walked into the room,
After my roommate came into the room,
Advanced Grammar Exercises
Table of English Grammar Contents (All Levels)
Elementary Grammar Exercises A1
Intermediate Grammar Exercises