Clarification #1: If a post contains more than one heading or question, you are NOT expected to comment on each of them. I will try to suggest at least a couple of different directions or avenues for response in order to appeal to the various personalities, interests, and mindsets of different students in the three classes. Pick one and do it well! (Hence my advisory in the Introduction that quality is more important than quantity.)
Clarification #2: Be sure to focus your comments on the knowledge issues raised in the post. For example, the comic strip in the post "Language, Open-mindedness" clearly has a political undertone and slant. However, responding to that political element should not be the focus of your comment. Unless...
Clarification #3: You do not have to limit your comments to the issues that I suggest for a particular post. You are encouraged to raise other knowledge issues that you see implied in the post. The operative term here is "knowledge issues." Thus, with respect to the example cited in Clarification #2 above, you could center your comment around what you think the political message or slant of the comic strip is as long as you talked about the basis for your claim to know what that message or slant is.