Ill. Put the articles:
1. ... Astana is ... capital of ... Kazakhstan
2. They have ... son and ... daughter.
3. ... Lake Baikal is ... deepest lake in ... world.
4. ... Irish Sea is between ... Great Britain and ... Ireland.
5. They are ... highest mountains in ... world.

Astana is the capital of Kazakhstan.They have a son and a daughter.Lake Baikal is the deepest lake in the world.The Irish Sea is between Great Britain and Ireland.They are the highest mountains in the world.