Remember you are not just responding willy-nilly to the piece, you have specific questions to answer. Audience and purpose have been huge focal points for me when choosing them, so they should be focal points for you when reading and responding.
One point of praise for all who have been completing the assignment: you are thinking and telling me your response. GOOD! keep thinking!! write your thoughts!! Pretty soon you are going to be responding to each other again (hint, hint!!), so make sure your responses are thoughtful because it can be embarrassing when your peers read your responses and you didn't think when you were writing them.