The first hand to be raised does not always have the privilege of answering. Everyone should feel comfortable in contributing to projects in ways that suit their styles. As a group member, be aware of the different ways of expressing ideas. A good group member is also a good listener. Stick with the assignment.
Small groups can be effective forums for discussing difficult ideas and for resolving questions.
Use the time wisely. Some discussion of other topics may break the ice within the group, but remember that you have a specific task to accomplish. Use the time to outline or cluster ideas, to clarify concepts, and to plan for how a product will culminate. If you do not understand what another person has said, ask for clarification. Alienating others in the group or intimidating them does not make for a good group interaction.