Use "least developed country" in a sentence

1. Cape Verde is actually graduating from least developed country status

2. This principle helps the developing country members, including the least developed country members among them, easily participate in the world trade system.

3. Togo is a least developed country(LDC)and, according to the UNDP[Sentence dictionary], it is 143rd(of177countries) in the Human Development Index classification.

4. But for various reasons, the education development priority has formed the formidable contrast in the developed country, the developing country and the least developed country.