When you ask a question, be patient. Someone will eventually respond. Sometimes people need a moment or two of silence to think about the question. If silence doesn't bother you, it won't bother anyone else. After someone responds, affirm the response with a simple "thanks" or "great answer." Then ask, "How about somebody else?" or "Would someone who hasn't shared like to add anything?" Be sensitive to new people or reluctant members who aren't ready to say, pray, or do anything. If you give them a safe setting, they will blossom over time.
This tip is from Saddleback's Leader Training 1