Write the next sentence in the following story.

How to become a chemistry teacher
Decide that teaching chemistry is right for you.
Being a teacher isn't about learning a subject. It's about being able to pass along that knowledge to others, many of whom won't be as interested as you.

[1]. You will have to be able to calculate the amount of time you've had teaching chemistry to find out what those hours are. Get a good idea of the average length of teaching hours for your area of interest, your conversational skills, and your strengths..
[2]. Nothing makes a successful chemistry teacher more confident than having the right motivation for learning and succeeding in his or her class. Understand that complete mastery of a subject will mean that you learn deeply enough to have a thicker grasp of the subject and you will have great proficiency with the subject..
[3]. You need to be able to get excited when explaining chemistry to others. You will need to be a strong communicator to help students understand concepts, and watch them carefully to notice when they may be struggling..
[4]. You don't need to be an expert in science to be an efficient career teacher. That comes too naturally in high school, where people are expected to focus their energy on their studies and the development of their careers... The answer should be
[3].