I do a mixture of all three. Most of the time I experience blocks. This happens very often when I'm on the phone. I will ask a question like "How long are you..." and the person on the other end will guess "Open?" I really dislike it when people finish my sentences for me. It's like they're stealing from me and doing something I can't seem to do on my own. I experience prolongations mainly when I'm saying a word that has an S in it. I'll say, "Sssssssssssso how are you today?" Sometimes the prolongation feels like it lasts ten seconds or more. I almost get stuck in the sound. I probably experience repetitions the least. They seem to make me feel the most embarrassed though.