Fun quiz, just a few suggestions. There are two Congos and they are always called Democratic Republic of the Congo or Republic of the Congo. To replace it, you could ask for the second-most populous African city (Cairo). I don't think the "Is" at the beginning of some clues is necessary because it seems like most of the clues are nouns. Having O, P, and Q all be capital cities is a bit repetitive. For O, you could do "The Canadian province with Toronto" (Ontario) or, for a challenge, "Alternative name for Rapa Iti" (Oparo). Nothing comes to mind for P or Q.