Be sure that you know when and how to ask questions. If you have trouble with students that call out answers, look at how you may be asking the questions.
There are two reasons that you would ask questions:
1. You want to get an idea of what the students already know.
2. You want to get an idea of what the students have learned from you and your lesson.
If you are "previewing" content say this:
"Raise your hand if you can tell me something about..." Then, only call on those students that have their hands raised and thank them for raising their hands.
If you are "reviewing" content say this:
"Don't raise your hand, don't call out, I will choose someone to answer...What is the....., (Student Name)?" Note - always put the students' name at the end of the question...if you put the students' name at the beginning, everyone else is tuning out and not listening...if they don't know who you are going to call on, they are more likely to listen.