Countries in the U.K.

How much do you know about the countries and cities in the U.K.?
Complete these sentences using:

Cardiff  -  Belfast  - Kingdom  - Edinburgh  - Scotland  - London  - Twelve -  four
There are _____ countries in the United Kingdom.
The countries are Northern Ireland, _____, England and Wales.
The capital or Northern Ireland is  _____. 
The capital of Scotland is _____ .
The capital of England is _____ .
And the capital of Wales is _____ .
London is the biggest  city in the United _____ .
_____  million people live in and around London.