In most cases, your answers should be at least 5 sentences long.
Some responses might take 30 seconds, while others might take over a minute. This is a tough balance because you do not want to talk too little (then the interviewer does not get a good sense of who you are), and you don’t want to talk too much either (you may end up getting off topic if you go on and on). Practice your responses to typical questions beforehand to get a feel for comfortable timing.
As you answer a question, pause for several seconds after a few sentences to make sure your interviewer does not have questions or comments about what you are saying.
It is okay if the interviewer interrupts you to ask more about something you have just said. Remember, they are trying to find out information from you. You need to answer the questions they ask, when they ask them.
Answer the question politely even though the information may already be in your resume or application.
Stay on topic. You should only provide information that is directly related to the job. The interview is not the time or place to talk about your special interests that don’t relate to the job.
Make eye contact and smile occasionally. 
Even if you are not smiling, you should use a pleasant facial expression, rather than a frown or scowl. Also, make sure you reduce nervous facial habits like biting your lip, rubbing your nose, or biting your nails.
Try not to have your voice sound monotone or bored. Instead, the tone of your voice should vary, and you should sound happy and excited to be there. 
Do not to yawn or look at the clock. This could make your interviewer think that you’re bored or impatient.
Try not to fidget in your chair during the interview. Clicking pens, tapping your fingers, and squirming in your seat do not make a good impression, so try your best to sit still. 
Do not eat or chew gum during the interview. That would be very unprofessional. If you get a dry throat from talking, you may bring water into the interview, but otherwise, try to avoid drinking during the interview too.
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