PNG for Papua New Guinea, Czechia for Czech Republic. Traditionally Congo gets you both Congos, but probably defeats the purpose of your question in this case.
The North/South question might be made a little clearer, I kept typing North Korea and South Korea and got nowhere quickly, I didn't consider Sudan because "North" Sudan is called simply Sudan.
Ethiopia was definitely controlled by Italy, at least in parts - first end of the 19th century, and again in 1936–1941, when it was called Italian East Africa.
The North/South question might be made a little clearer, I kept typing North Korea and South Korea and got nowhere quickly, I didn't consider Sudan because "North" Sudan is called simply Sudan.