Carry yourself well as you walk into the interview. This will create an initial positive impression with your interviewer and indicate your confidence. These sentence fillers may buy you a few seconds to gather your thoughts, but they are barriers to clarity. Take several seconds to think prior to beginning your answer if you need to. Speak in a clear, well-modulated, audible voice.
Many people tend to show their nervousness by talking rapidly.
Check your voice tone, inflection and volume during the interview. Remember your voice is a primary instrument of communication. Do not hesitate to smile in the interview when appropriate. In general, be sure your facial expression matches what you are saying. For example, when discussing a serious issue, a smile would be inappropriate.