抱歉，我的中文不成。 所有草稿都是用英文写的。 请用谷歌翻译。

1. One of the  former French colonies in Africa,
2. Spanish Sahara,
3. Switzerland,  city is Bern.
4. Argentina,
5. Brazil.
6. ?.?

Since your middle name is  学, I do not need to explain that part of the fun of stamp collecting is to learn languages, geography, history etc. Please enter your search term into the web browser and start doing your assignment. For extra credit, you have to learn Latin for correct flora and fauna names.
As for myself, no longer do I use title of paintings in English but instead the original titles used by the painters, may it be in French, Italian etc.
The same would apply for cities, for example, I do not write Florence but now write Firenze, as would anyone who has set foot in Italy.
Happy New Year And keep on learning.