Should you repeat what you said at the end of your turn?
No. You turns are too short. Don't repeat ideas. And try to use synonyms.
I can just ignore the situation and answer the questions, right?
No. You must remember 1. Your viewpoint. 2. The viewpoint of the stakeholders involved.
What should you do if all three members have offered their opinion on a bullet point?
Move to the next point.
Should you be afraid of stealing time from other members?
Don't be afraid. Practice, so you learn how long 20 seconds feels.
What should you do when the teachers says, "You may begin your discussion now."
Jump in.
Should you always say, "What do you think of my suggestion?"
No. Let the other members link to you.