What is the reason behind different names of one country and why it is not followed by every countries?

How many members are present from Asia write your country name and what is the reason to join it?

Which sentence used the underline vocabulary word incorrectly?

A.  The subsequent punishment was to wash the dishes for an entire month.

B.  Every country needs a stable economy to thrive.

C.  His car ran perfectly because he negligently to care of it.

Sir Edward Elgar's "Enigma Variations"

A. are variations on a theme about different countries.

B. are musical "illustrations" of Elgar's friends and some of his experiences with them.

C. are based on the theme songs from many popular movies.