Help the game show host announce the contestant's situation by choosing the correct verb form.

Even though time is running out, Rahul looks perfectly calm because he ___ exactly how to solve the puzzle.

The correct answer is knows.

"Know" is a stative verb (a verb that describes a state of being rather than a physical action). In standard English, stative verbs are rarely used in the continuous "-ing" form, even if the state is happening right now!