The yellow question seems to have caused the most confusion. I think people just were not reading it completely:
"Suppose that, on the basis of a nation's PPC, an economy must sacrifice 10,000 pizzas domestically to get the 1 additional robot it desires, but can get the robot from another country for 9,000 pizzas. Relate this information to the following statement: 'Through international specialization and trade, a nation can reduce it's opportunity cost of obtaining goods and thus move outside its PPC.'"
Check a couple of things here:
~Nowhere is it asking you to figure out the trade matrix - it is not necessary to answer the question
~Nowhere does it say that the robot helps make pizzas - they are unrelated
~What is it asking?
Don't get caught up in superfluous information. There's a lot of it in this question.
What is it asking? What is the answer?